138221712 has 30 divisors (see below), whose sum is σ = 386829222. Its totient is φ = 46073856.

The previous prime is 138221711. The next prime is 138221723. The reversal of 138221712 is 217122831.

It can be written as a sum of positive squares in only one way, i.e., 72999936 + 65221776 = 8544^2 + 8076^2 .

It is not an unprimeable number, because it can be changed into a prime (138221711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 479793 + ... + 480080.

Almost surely, 2^138221712 is an apocalyptic number.

138221712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138221712 is an abundant number, since it is smaller than the sum of its proper divisors (248607510).

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

138221712 is a wasteful number, since it uses less digits than its factorization.

138221712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959887 (or 959878 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 138221712 is about 11756.7730266430. The cubic root of 138221712 is about 517.0415235016.

The spelling of 138221712 in words is "one hundred thirty-eight million, two hundred twenty-one thousand, seven hundred twelve".