138990951 has 32 divisors (see below), whose sum is σ = 225331200. Its totient is φ = 83975040.

The previous prime is 138990937. The next prime is 138990983. The reversal of 138990951 is 159099831.

It is not a de Polignac number, because 138990951 - 2⁵ = 138990919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138990897 and 138990906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138990991) 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 31 ways as a sum of consecutive naturals, for example, 141775 + ... + 142751.

It is an arithmetic number, because the mean of its divisors is an integer number (7041600).

Almost surely, 2^138990951 is an apocalyptic number.

138990951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138990951 is a deficient number, since it is larger than the sum of its proper divisors (86340249).

138990951 is a wasteful number, since it uses less digits than its factorization.

138990951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 138990951 is about 11789.4423532243. The cubic root of 138990951 is about 517.9989055497.

The spelling of 138990951 in words is "one hundred thirty-eight million, nine hundred ninety thousand, nine hundred fifty-one".