1657808940 has 24 divisors (see below), whose sum is σ = 4641865200. Its totient is φ = 442082368.

The previous prime is 1657808909. The next prime is 1657808993. The reversal of 1657808940 is 498087561.

It is a self number, because there is not a number n which added to its sum of digits gives 1657808940.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13815015 + ... + 13815134.

It is an arithmetic number, because the mean of its divisors is an integer number (193411050).

Almost surely, 2^1657808940 is an apocalyptic number.

1657808940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1657808940 is an abundant number, since it is smaller than the sum of its proper divisors (2984056260).

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

1657808940 is a wasteful number, since it uses less digits than its factorization.

1657808940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27630161 (or 27630159 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 1657808940 is about 40716.1999700365. The cubic root of 1657808940 is about 1183.5269702738.

The spelling of 1657808940 in words is "one billion, six hundred fifty-seven million, eight hundred eight thousand, nine hundred forty".