138784536 has 64 divisors (see below), whose sum is σ = 420566400. Its totient is φ = 42055200.

The previous prime is 138784519. The next prime is 138784559. The reversal of 138784536 is 635487831.

138784536 is a `hidden beast` number, since 1 + 38 + 7 + 84 + 536 = 666.

It is a super-2 number, since 2×138784536² = 38522294865470592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138784491 and 138784500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26830 + ... + 31581.

It is an arithmetic number, because the mean of its divisors is an integer number (6571350).

Almost surely, 2^138784536 is an apocalyptic number.

It is an amenable number.

138784536 is an abundant number, since it is smaller than the sum of its proper divisors (281781864).

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

138784536 is a wasteful number, since it uses less digits than its factorization.

138784536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58437 (or 58427 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 138784536 is about 11780.6848697349. The cubic root of 138784536 is about 517.7423523539.

The spelling of 138784536 in words is "one hundred thirty-eight million, seven hundred eighty-four thousand, five hundred thirty-six".