1521299856 has 160 divisors (see below), whose sum is σ = 4220587008. Its totient is φ = 471144960.

The previous prime is 1521299849. The next prime is 1521299861. The reversal of 1521299856 is 6589921251.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 9689730 + ... + 9689886.

Almost surely, 2^1521299856 is an apocalyptic number.

1521299856 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 1521299856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2110293504).

1521299856 is an abundant number, since it is smaller than the sum of its proper divisors (2699287152).

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

1521299856 is a wasteful number, since it uses less digits than its factorization.

1521299856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 383 counting only the distinct ones).

The product of its digits is 388800, while the sum is 48.

The square root of 1521299856 is about 39003.8441182404. The cubic root of 1521299856 is about 1150.1070740882.

The spelling of 1521299856 in words is "one billion, five hundred twenty-one million, two hundred ninety-nine thousand, eight hundred fifty-six".