138731356 has 12 divisors (see below), whose sum is σ = 257061168. Its totient is φ = 65285312.

The previous prime is 138731353. The next prime is 138731387. The reversal of 138731356 is 653137831.

It is a happy number.

138731356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138731353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020016 + ... + 1020151.

It is an arithmetic number, because the mean of its divisors is an integer number (21421764).

Almost surely, 2^138731356 is an apocalyptic number.

It is an amenable number.

138731356 is a deficient number, since it is larger than the sum of its proper divisors (118329812).

138731356 is a wasteful number, since it uses less digits than its factorization.

138731356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040188 (or 2040186 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 138731356 is about 11778.4275690773. The cubic root of 138731356 is about 517.6762137272.

The spelling of 138731356 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, three hundred fifty-six".