138726320 has 40 divisors (see below), whose sum is σ = 331263024. Its totient is φ = 53989632.

The previous prime is 138726319. The next prime is 138726349. The reversal of 138726320 is 23627831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20474 + ... + 26393.

Almost surely, 2^138726320 is an apocalyptic number.

138726320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138726320 is an abundant number, since it is smaller than the sum of its proper divisors (192536704).

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

138726320 is a wasteful number, since it uses less digits than its factorization.

138726320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46917 (or 46911 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 138726320 is about 11778.2137864788. The cubic root of 138726320 is about 517.6699497048.

The spelling of 138726320 in words is "one hundred thirty-eight million, seven hundred twenty-six thousand, three hundred twenty".