1556980040 has 64 divisors (see below), whose sum is σ = 4367640960. Its totient is φ = 485291520.

The previous prime is 1556980039. The next prime is 1556980057. The reversal of 1556980040 is 400896551.

It is a junction number, because it is equal to n+sod(n) for n = 1556979976 and 1556980003.

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, 249677 + ... + 255836.

It is an arithmetic number, because the mean of its divisors is an integer number (68244390).

Almost surely, 2^1556980040 is an apocalyptic number.

1556980040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1556980040 is an abundant number, since it is smaller than the sum of its proper divisors (2810660920).

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

1556980040 is a wasteful number, since it uses less digits than its factorization.

1556980040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505542 (or 505538 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1556980040 is about 39458.5863913040. The cubic root of 1556980040 is about 1159.0291222390.

The spelling of 1556980040 in words is "one billion, five hundred fifty-six million, nine hundred eighty thousand, forty".