1897136688 has 20 divisors (see below), whose sum is σ = 4900936568. Its totient is φ = 632378880.

The previous prime is 1897136687. The next prime is 1897136693. The reversal of 1897136688 is 8866317981.

It is a super-2 number, since 2×1897136688² = 7198255225911218688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897136687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19761793 + ... + 19761888.

Almost surely, 2^1897136688 is an apocalyptic number.

It is an amenable number.

1897136688 is an abundant number, since it is smaller than the sum of its proper divisors (3003799880).

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

1897136688 is a wasteful number, since it uses less digits than its factorization.

1897136688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39523692 (or 39523686 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 57.

The square root of 1897136688 is about 43556.1326106899. The cubic root of 1897136688 is about 1237.9398430772.

The spelling of 1897136688 in words is "one billion, eight hundred ninety-seven million, one hundred thirty-six thousand, six hundred eighty-eight".