139888791 has 12 divisors (see below), whose sum is σ = 230927632. Its totient is φ = 79936416.

The previous prime is 139888787. The next prime is 139888807. The reversal of 139888791 is 197888931.

It is not a de Polignac number, because 139888791 - 2² = 139888787 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 (139888711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110166 + ... + 1110291.

Almost surely, 2^139888791 is an apocalyptic number.

139888791 is a deficient number, since it is larger than the sum of its proper divisors (91038841).

139888791 is a wasteful number, since it uses less digits than its factorization.

139888791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220470 (or 2220467 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 139888791 is about 11827.4591946030. The cubic root of 139888791 is about 519.1118851747. Note that the first 3 decimals are identical.

The spelling of 139888791 in words is "one hundred thirty-nine million, eight hundred eighty-eight thousand, seven hundred ninety-one".