138784456 has 8 divisors (see below), whose sum is σ = 260220870. Its totient is φ = 69392224.

The previous prime is 138784441. The next prime is 138784463. The reversal of 138784456 is 654487831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 111640356 + 27144100 = 10566^2 + 5210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138784456² = 38522250454431872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8674021 + ... + 8674036.

Almost surely, 2^138784456 is an apocalyptic number.

It is an amenable number.

138784456 is a deficient number, since it is larger than the sum of its proper divisors (121436414).

138784456 is a wasteful number, since it uses less digits than its factorization.

138784456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17348063 (or 17348059 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 138784456 is about 11780.6814743460. The cubic root of 138784456 is about 517.7422528726.

The spelling of 138784456 in words is "one hundred thirty-eight million, seven hundred eighty-four thousand, four hundred fifty-six".