138833208 has 48 divisors (see below), whose sum is σ = 388978200. Its totient is φ = 44681280.

The previous prime is 138833183. The next prime is 138833239. The reversal of 138833208 is 802338831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31158 + ... + 35333.

Almost surely, 2^138833208 is an apocalyptic number.

138833208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138833208 is an abundant number, since it is smaller than the sum of its proper divisors (250144992).

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

138833208 is a wasteful number, since it uses less digits than its factorization.

138833208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66532 (or 66525 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 138833208 is about 11782.7504429144. The cubic root of 138833208 is about 517.8028696882.

It can be divided in two parts, 1388 and 33208, that added together give a square (34596 = 186²).

The spelling of 138833208 in words is "one hundred thirty-eight million, eight hundred thirty-three thousand, two hundred eight".