138936556 has 18 divisors (see below), whose sum is σ = 267252860. Its totient is φ = 63152760.

The previous prime is 138936547. The next prime is 138936557. The reversal of 138936556 is 655639831.

It is a super-2 number, since 2×138936556² = 38606733186282272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138936557) 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, 143046 + ... + 144013.

Almost surely, 2^138936556 is an apocalyptic number.

It is an amenable number.

138936556 is a deficient number, since it is larger than the sum of its proper divisors (128316304).

138936556 is a wasteful number, since it uses less digits than its factorization.

138936556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287085 (or 287072 counting only the distinct ones).

The product of its digits is 583200, while the sum is 46.

The square root of 138936556 is about 11787.1351905372. The cubic root of 138936556 is about 517.9313226681.

It can be divided in two parts, 13893 and 6556, that added together give a square (20449 = 143²).

The spelling of 138936556 in words is "one hundred thirty-eight million, nine hundred thirty-six thousand, five hundred fifty-six".