1550845440 has 320 divisors, whose sum is σ = 5596873920. Its totient is φ = 412065792.

The previous prime is 1550845421. The next prime is 1550845453. The reversal of 1550845440 is 445480551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (320).

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

It is a junction number, because it is equal to n+sod(n) for n = 1550845395 and 1550845404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5598582 + ... + 5598858.

It is an arithmetic number, because the mean of its divisors is an integer number (17490231).

Almost surely, 2^1550845440 is an apocalyptic number.

1550845440 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 1550845440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2798436960).

1550845440 is an abundant number, since it is smaller than the sum of its proper divisors (4046028480).

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

1550845440 is an frugal number, since it uses more digits than its factorization.

1550845440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The square root of 1550845440 is about 39380.7750050707. The cubic root of 1550845440 is about 1157.5049025849.

The spelling of 1550845440 in words is "one billion, five hundred fifty million, eight hundred forty-five thousand, four hundred forty".