138620331 has 12 divisors (see below), whose sum is σ = 200505760. Its totient is φ = 92286000.

The previous prime is 138620297. The next prime is 138620353. The reversal of 138620331 is 133026831.

It is a happy number.

138620331 is a `hidden beast` number, since 1 + 3 + 8 + 620 + 3 + 31 = 666.

It is not a de Polignac number, because 138620331 - 2¹⁴ = 138603947 is a prime.

It is a super-2 number, since 2×138620331² = 38431192333099122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138620295 and 138620304.

It is not an unprimeable number, because it can be changed into a prime (138620381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3496 + ... + 17013.

Almost surely, 2^138620331 is an apocalyptic number.

138620331 is a deficient number, since it is larger than the sum of its proper divisors (61885429).

138620331 is a wasteful number, since it uses less digits than its factorization.

138620331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21266 (or 21263 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 138620331 is about 11773.7135603003. The cubic root of 138620331 is about 517.5380802336.

The spelling of 138620331 in words is "one hundred thirty-eight million, six hundred twenty thousand, three hundred thirty-one".