118640939 has 4 divisors (see below), whose sum is σ = 118916640. Its totient is φ = 118365240.

The previous prime is 118640933. The next prime is 118640953. The reversal of 118640939 is 939046811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939046811 = 83 ⋅11313817.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118640939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 118640896 and 118640905.

It is not an unprimeable number, because it can be changed into a prime (118640933) 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, 137204 + ... + 138065.

It is an arithmetic number, because the mean of its divisors is an integer number (29729160).

Almost surely, 2^118640939 is an apocalyptic number.

118640939 is a deficient number, since it is larger than the sum of its proper divisors (275701).

118640939 is an equidigital number, since it uses as much as digits as its factorization.

118640939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275700.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 118640939 is about 10892.2421475103. The cubic root of 118640939 is about 491.3732669622.

The spelling of 118640939 in words is "one hundred eighteen million, six hundred forty thousand, nine hundred thirty-nine".