1557531372 has 24 divisors (see below), whose sum is σ = 3649844016. Its totient is φ = 516947968.

The previous prime is 1557531359. The next prime is 1557531377. The reversal of 1557531372 is 2731357551.

1557531372 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1557531372.

It is not an unprimeable number, because it can be changed into a prime (1557531377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275733 + ... + 281324.

It is an arithmetic number, because the mean of its divisors is an integer number (152076834).

Almost surely, 2^1557531372 is an apocalyptic number.

1557531372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1557531372 is an abundant number, since it is smaller than the sum of its proper divisors (2092312644).

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

1557531372 is a wasteful number, since it uses less digits than its factorization.

1557531372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557297 (or 557295 counting only the distinct ones).

The product of its digits is 110250, while the sum is 39.

The square root of 1557531372 is about 39465.5719836923. The cubic root of 1557531372 is about 1159.1659114971.

The spelling of 1557531372 in words is "one billion, five hundred fifty-seven million, five hundred thirty-one thousand, three hundred seventy-two".