1897685808 has 40 divisors (see below), whose sum is σ = 4969519728. Its totient is φ = 623895552.

The previous prime is 1897685807. The next prime is 1897685813. The reversal of 1897685808 is 8085867981.

It is a super-2 number, since 2×1897685808² = 7202422851769225728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897685807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267285 + ... + 274292.

Almost surely, 2^1897685808 is an apocalyptic number.

It is an amenable number.

1897685808 is an abundant number, since it is smaller than the sum of its proper divisors (3071833920).

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

1897685808 is a wasteful number, since it uses less digits than its factorization.

1897685808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541661 (or 541655 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 60.

The square root of 1897685808 is about 43562.4357445724. The cubic root of 1897685808 is about 1238.0592707662.

The spelling of 1897685808 in words is "one billion, eight hundred ninety-seven million, six hundred eighty-five thousand, eight hundred eight".