118131638 has 16 divisors (see below), whose sum is σ = 184633344. Its totient is φ = 56623080.

The previous prime is 118131631. The next prime is 118131649. The reversal of 118131638 is 836131811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118131631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2270 + ... + 15537.

It is an arithmetic number, because the mean of its divisors is an integer number (11539584).

Almost surely, 2^118131638 is an apocalyptic number.

118131638 is a deficient number, since it is larger than the sum of its proper divisors (66501706).

118131638 is a wasteful number, since it uses less digits than its factorization.

118131638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17947.

The product of its digits is 3456, while the sum is 32.

The square root of 118131638 is about 10868.8379323643. The cubic root of 118131638 is about 490.6691371871.

The spelling of 118131638 in words is "one hundred eighteen million, one hundred thirty-one thousand, six hundred thirty-eight".