117640957 has 4 divisors (see below), whose sum is σ = 134446816. Its totient is φ = 100835100.

The previous prime is 117640949. The next prime is 117640961. The reversal of 117640957 is 759046711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759046711 = 643 ⋅1180477.

It is a cyclic number.

It is not a de Polignac number, because 117640957 - 2³ = 117640949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117640967) 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, 8402919 + ... + 8402932.

It is an arithmetic number, because the mean of its divisors is an integer number (33611704).

Almost surely, 2^117640957 is an apocalyptic number.

It is an amenable number.

117640957 is a deficient number, since it is larger than the sum of its proper divisors (16805859).

117640957 is an equidigital number, since it uses as much as digits as its factorization.

117640957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16805858.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 117640957 is about 10846.2416071190. The cubic root of 117640957 is about 489.9888335648.

The spelling of 117640957 in words is "one hundred seventeen million, six hundred forty thousand, nine hundred fifty-seven".