118218638 has 4 divisors (see below), whose sum is σ = 177327960. Its totient is φ = 59109318.

The previous prime is 118218623. The next prime is 118218647. The reversal of 118218638 is 836812811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836812811 = 17 ⋅49224283.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 29554658 + ... + 29554661.

It is an arithmetic number, because the mean of its divisors is an integer number (44331990).

Almost surely, 2^118218638 is an apocalyptic number.

118218638 is a deficient number, since it is larger than the sum of its proper divisors (59109322).

118218638 is an equidigital number, since it uses as much as digits as its factorization.

118218638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59109321.

The product of its digits is 18432, while the sum is 38.

The square root of 118218638 is about 10872.8394635440. The cubic root of 118218638 is about 490.7895614315.

The spelling of 118218638 in words is "one hundred eighteen million, two hundred eighteen thousand, six hundred thirty-eight".