138531396 has 12 divisors (see below), whose sum is σ = 323239952. Its totient is φ = 46177128.

The previous prime is 138531389. The next prime is 138531401. The reversal of 138531396 is 693135831.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772130 + ... + 5772153.

Almost surely, 2^138531396 is an apocalyptic number.

It is an amenable number.

138531396 is an abundant number, since it is smaller than the sum of its proper divisors (184708556).

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

138531396 is a wasteful number, since it uses less digits than its factorization.

138531396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11544290 (or 11544288 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 138531396 is about 11769.9361085777. The cubic root of 138531396 is about 517.4273771459.

The spelling of 138531396 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, three hundred ninety-six".