118420857 has 12 divisors (see below), whose sum is σ = 171363504. Its totient is φ = 78803640.

The previous prime is 118420843. The next prime is 118420867. The reversal of 118420857 is 758024811.

It is not a de Polignac number, because 118420857 - 2¹⁵ = 118388089 is a prime.

It is a super-2 number, since 2×118420857² = 28046998745228898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (118420807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6619 + ... + 16752.

It is an arithmetic number, because the mean of its divisors is an integer number (14280292).

Almost surely, 2^118420857 is an apocalyptic number.

It is an amenable number.

118420857 is a deficient number, since it is larger than the sum of its proper divisors (52942647).

118420857 is a wasteful number, since it uses less digits than its factorization.

118420857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23940 (or 23937 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 118420857 is about 10882.1347629957. The cubic root of 118420857 is about 491.0692422013.

The spelling of 118420857 in words is "one hundred eighteen million, four hundred twenty thousand, eight hundred fifty-seven".