138604636 has 12 divisors (see below), whose sum is σ = 243194112. Its totient is φ = 69120608.

The previous prime is 138604633. The next prime is 138604649. The reversal of 138604636 is 636406831.

It is a super-2 number, since 2×138604636² = 38422490241384992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138604595 and 138604604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138604633) 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 in 3 ways as a sum of consecutive naturals, for example, 43705 + ... + 46768.

It is an arithmetic number, because the mean of its divisors is an integer number (20266176).

Almost surely, 2^138604636 is an apocalyptic number.

It is an amenable number.

138604636 is a deficient number, since it is larger than the sum of its proper divisors (104589476).

138604636 is a wasteful number, since it uses less digits than its factorization.

138604636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90860 (or 90858 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 138604636 is about 11773.0470142610. The cubic root of 138604636 is about 517.5185471038.

It can be divided in two parts, 13860 and 4636, that added together give a square (18496 = 136²).

The spelling of 138604636 in words is "one hundred thirty-eight million, six hundred four thousand, six hundred thirty-six".