1897117136 has 20 divisors (see below), whose sum is σ = 3679303200. Its totient is φ = 947619552.

The previous prime is 1897117133. The next prime is 1897117151. The reversal of 1897117136 is 6317117981.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897117133) 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, 41876 + ... + 74483.

It is an arithmetic number, because the mean of its divisors is an integer number (183965160).

Almost surely, 2^1897117136 is an apocalyptic number.

1897117136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1897117136 is a deficient number, since it is larger than the sum of its proper divisors (1782186064).

1897117136 is a wasteful number, since it uses less digits than its factorization.

1897117136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117386 (or 117380 counting only the distinct ones).

The product of its digits is 63504, while the sum is 44.

The square root of 1897117136 is about 43555.9081641056. The cubic root of 1897117136 is about 1237.9355903028.

The spelling of 1897117136 in words is "one billion, eight hundred ninety-seven million, one hundred seventeen thousand, one hundred thirty-six".