1557752140 has 72 divisors (see below), whose sum is σ = 3815193312. Its totient is φ = 532707840.

The previous prime is 1557752129. The next prime is 1557752153. The reversal of 1557752140 is 412577551.

It is a self number, because there is not a number n which added to its sum of digits gives 1557752140.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 422505 + ... + 426175.

It is an arithmetic number, because the mean of its divisors is an integer number (52988796).

Almost surely, 2^1557752140 is an apocalyptic number.

1557752140 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 1557752140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907596656).

1557752140 is an abundant number, since it is smaller than the sum of its proper divisors (2257441172).

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

1557752140 is a wasteful number, since it uses less digits than its factorization.

1557752140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127 (or 4118 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 37.

The square root of 1557752140 is about 39468.3688540583. The cubic root of 1557752140 is about 1159.2206765042.

The spelling of 1557752140 in words is "one billion, five hundred fifty-seven million, seven hundred fifty-two thousand, one hundred forty".