138409136 has 20 divisors (see below), whose sum is σ = 272172312. Its totient is φ = 68171136.

The previous prime is 138409097. The next prime is 138409157. The reversal of 138409136 is 631904831.

It is a junction number, because it is equal to n+sod(n) for n = 138409096 and 138409105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63485 + ... + 65628.

Almost surely, 2^138409136 is an apocalyptic number.

138409136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138409136 is a deficient number, since it is larger than the sum of its proper divisors (133763176).

138409136 is a wasteful number, since it uses less digits than its factorization.

138409136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129188 (or 129182 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138409136 is about 11764.7412211234. The cubic root of 138409136 is about 517.2751149339.

The spelling of 138409136 in words is "one hundred thirty-eight million, four hundred nine thousand, one hundred thirty-six".