138950791 has 4 divisors (see below), whose sum is σ = 158800912. Its totient is φ = 119100672.

The previous prime is 138950737. The next prime is 138950807. The reversal of 138950791 is 197059831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138950791 - 2⁷ = 138950663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138950701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9925050 + ... + 9925063.

It is an arithmetic number, because the mean of its divisors is an integer number (39700228).

Almost surely, 2^138950791 is an apocalyptic number.

138950791 is a deficient number, since it is larger than the sum of its proper divisors (19850121).

138950791 is an equidigital number, since it uses as much as digits as its factorization.

138950791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19850120.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 138950791 is about 11787.7390113626. The cubic root of 138950791 is about 517.9490105990.

The spelling of 138950791 in words is "one hundred thirty-eight million, nine hundred fifty thousand, seven hundred ninety-one".