138815212 has 24 divisors (see below), whose sum is σ = 254725632. Its totient is φ = 66066000.

The previous prime is 138815203. The next prime is 138815227. The reversal of 138815212 is 212518831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15837 + ... + 22987.

It is an arithmetic number, because the mean of its divisors is an integer number (10613568).

Almost surely, 2^138815212 is an apocalyptic number.

It is an amenable number.

138815212 is a deficient number, since it is larger than the sum of its proper divisors (115910420).

138815212 is a wasteful number, since it uses less digits than its factorization.

138815212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389 (or 7387 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 138815212 is about 11781.9867594561. The cubic root of 138815212 is about 517.7804956390.

The spelling of 138815212 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, two hundred twelve".