138605224 has 16 divisors (see below), whose sum is σ = 260161920. Its totient is φ = 69228720.

The previous prime is 138605213. The next prime is 138605231. The reversal of 138605224 is 422506831.

It is a super-2 number, since 2×138605224² = 38422816240180352, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 814 + ... + 16669.

It is an arithmetic number, because the mean of its divisors is an integer number (16260120).

Almost surely, 2^138605224 is an apocalyptic number.

It is an amenable number.

138605224 is a deficient number, since it is larger than the sum of its proper divisors (121556696).

138605224 is a wasteful number, since it uses less digits than its factorization.

138605224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480 (or 18476 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 138605224 is about 11773.0719865293. The cubic root of 138605224 is about 517.5192789227.

The spelling of 138605224 in words is "one hundred thirty-eight million, six hundred five thousand, two hundred twenty-four".