139323791 has 4 divisors (see below), whose sum is σ = 140259000. Its totient is φ = 138388584.

The previous prime is 139323763. The next prime is 139323799. The reversal of 139323791 is 197323931.

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 139323791 - 2⁶ = 139323727 is a prime.

It is a super-2 number, since 2×139323791² = 38822237477223362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139323799) 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, 467381 + ... + 467678.

It is an arithmetic number, because the mean of its divisors is an integer number (35064750).

Almost surely, 2^139323791 is an apocalyptic number.

139323791 is a deficient number, since it is larger than the sum of its proper divisors (935209).

139323791 is an equidigital number, since it uses as much as digits as its factorization.

139323791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935208.

The product of its digits is 30618, while the sum is 38.

The square root of 139323791 is about 11803.5499321179. The cubic root of 139323791 is about 518.4120579023.

The spelling of 139323791 in words is "one hundred thirty-nine million, three hundred twenty-three thousand, seven hundred ninety-one".