1557944980 has 48 divisors (see below), whose sum is σ = 3301853184. Its totient is φ = 617460480.

The previous prime is 1557944933. The next prime is 1557945013. The reversal of 1557944980 is 894497551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1195009 + ... + 1196311.

It is an arithmetic number, because the mean of its divisors is an integer number (68788608).

Almost surely, 2^1557944980 is an apocalyptic number.

1557944980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1557944980 is an abundant number, since it is smaller than the sum of its proper divisors (1743908204).

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

1557944980 is a wasteful number, since it uses less digits than its factorization.

1557944980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 52.

The square root of 1557944980 is about 39470.8117474166. The cubic root of 1557944980 is about 1159.2685092939.

The spelling of 1557944980 in words is "one billion, five hundred fifty-seven million, nine hundred forty-four thousand, nine hundred eighty".