1557840252 has 24 divisors (see below), whose sum is σ = 3686159232. Its totient is φ = 511966000.

The previous prime is 1557840233. The next prime is 1557840259. The reversal of 1557840252 is 2520487551.

It is a self number, because there is not a number n which added to its sum of digits gives 1557840252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557840259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 913374 + ... + 915077.

It is an arithmetic number, because the mean of its divisors is an integer number (153589968).

Almost surely, 2^1557840252 is an apocalyptic number.

1557840252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1557840252 is an abundant number, since it is smaller than the sum of its proper divisors (2128318980).

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

1557840252 is a wasteful number, since it uses less digits than its factorization.

1557840252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828529 (or 1828527 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 39.

The square root of 1557840252 is about 39469.4850739150. The cubic root of 1557840252 is about 1159.2425326399.

The spelling of 1557840252 in words is "one billion, five hundred fifty-seven million, eight hundred forty thousand, two hundred fifty-two".