138645318 has 32 divisors (see below), whose sum is σ = 333584640. Its totient is φ = 37527840.

The previous prime is 138645293. The next prime is 138645329. The reversal of 138645318 is 813546831.

It is a super-2 number, since 2×138645318² = 38445048406642248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86073 + ... + 87668.

It is an arithmetic number, because the mean of its divisors is an integer number (10424520).

Almost surely, 2^138645318 is an apocalyptic number.

138645318 is an abundant number, since it is smaller than the sum of its proper divisors (194939322).

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

138645318 is a wasteful number, since it uses less digits than its factorization.

138645318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173772.

The product of its digits is 69120, while the sum is 39.

The square root of 138645318 is about 11774.7746475251. The cubic root of 138645318 is about 517.5691746312.

The spelling of 138645318 in words is "one hundred thirty-eight million, six hundred forty-five thousand, three hundred eighteen".