138369018 has 32 divisors (see below), whose sum is σ = 297046656. Its totient is φ = 42812928.

The previous prime is 138369017. The next prime is 138369031. The reversal of 138369018 is 810963831.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138369013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1846 + ... + 16737.

It is an arithmetic number, because the mean of its divisors is an integer number (9282708).

Almost surely, 2^138369018 is an apocalyptic number.

138369018 is an abundant number, since it is smaller than the sum of its proper divisors (158677638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138369018 is a wasteful number, since it uses less digits than its factorization.

138369018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18678.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 138369018 is about 11763.0360876774. The cubic root of 138369018 is about 517.2251325677.

The spelling of 138369018 in words is "one hundred thirty-eight million, three hundred sixty-nine thousand, eighteen".