138621412 has 6 divisors (see below), whose sum is σ = 242587478. Its totient is φ = 69310704.

The previous prime is 138621403. The next prime is 138621419. The reversal of 138621412 is 214126831.

It can be written as a sum of positive squares in only one way, i.e., 81830116 + 56791296 = 9046^2 + 7536^2 .

It is not an unprimeable number, because it can be changed into a prime (138621419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17327673 + ... + 17327680.

Almost surely, 2^138621412 is an apocalyptic number.

It is an amenable number.

138621412 is a deficient number, since it is larger than the sum of its proper divisors (103966066).

138621412 is a wasteful number, since it uses less digits than its factorization.

138621412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34655357 (or 34655355 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 138621412 is about 11773.7594675618. The cubic root of 138621412 is about 517.5394255322.

The spelling of 138621412 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, four hundred twelve".