138263212 has 12 divisors (see below), whose sum is σ = 252480816. Its totient is φ = 66125840.

The previous prime is 138263207. The next prime is 138263231. The reversal of 138263212 is 212362831.

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, 751339 + ... + 751522.

It is an arithmetic number, because the mean of its divisors is an integer number (21040068).

Almost surely, 2^138263212 is an apocalyptic number.

It is an amenable number.

138263212 is a deficient number, since it is larger than the sum of its proper divisors (114217604).

138263212 is a wasteful number, since it uses less digits than its factorization.

138263212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502888 (or 1502886 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 138263212 is about 11758.5378342717. The cubic root of 138263212 is about 517.0932642299.

The spelling of 138263212 in words is "one hundred thirty-eight million, two hundred sixty-three thousand, two hundred twelve".