1555420200 has 96 divisors (see below), whose sum is σ = 4869732960. Its totient is φ = 410656000.

The previous prime is 1555420193. The next prime is 1555420231. The reversal of 1555420200 is 20245551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47767 + ... + 73433.

It is an arithmetic number, because the mean of its divisors is an integer number (50726385).

Almost surely, 2^1555420200 is an apocalyptic number.

1555420200 is a gapful number since it is divisible by the number (10) 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 1555420200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2434866480).

1555420200 is an abundant number, since it is smaller than the sum of its proper divisors (3314312760).

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

1555420200 is a wasteful number, since it uses less digits than its factorization.

1555420200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25787 (or 25778 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 1555420200 is about 39438.8159051460. The cubic root of 1555420200 is about 1158.6419402123.

Adding to 1555420200 its reverse (20245551), we get a palindrome (1575665751).

The spelling of 1555420200 in words is "one billion, five hundred fifty-five million, four hundred twenty thousand, two hundred".