1555900416 has 288 divisors, whose sum is σ = 5314982400. Its totient is φ = 429096960.

The previous prime is 1555900397. The next prime is 1555900417. The reversal of 1555900416 is 6140095551.

1555900416 is a `hidden beast` number, since 1 + 55 + 590 + 0 + 4 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×1555900416² = 4841652209017946112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1555900417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3999550 + ... + 3999938.

It is an arithmetic number, because the mean of its divisors is an integer number (18454800).

Almost surely, 2^1555900416 is an apocalyptic number.

1555900416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555900416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2657491200).

1555900416 is an abundant number, since it is smaller than the sum of its proper divisors (3759081984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555900416 is a wasteful number, since it uses less digits than its factorization.

1555900416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1555900416 is about 39444.9035491279. The cubic root of 1555900416 is about 1158.7611665468.

Adding to 1555900416 its reverse (6140095551), we get a palindrome (7695995967).

The spelling of 1555900416 in words is "one billion, five hundred fifty-five million, nine hundred thousand, four hundred sixteen".