139488291 has 32 divisors (see below), whose sum is σ = 219340800. Its totient is φ = 87363360.

The previous prime is 139488277. The next prime is 139488337. The reversal of 139488291 is 192884931.

It is not a de Polignac number, because 139488291 - 2⁷ = 139488163 is a prime.

It is a super-2 number, since 2×139488291² = 38913966652201362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139488211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64081 + ... + 66221.

It is an arithmetic number, because the mean of its divisors is an integer number (6854400).

Almost surely, 2^139488291 is an apocalyptic number.

139488291 is a deficient number, since it is larger than the sum of its proper divisors (79852509).

139488291 is a wasteful number, since it uses less digits than its factorization.

139488291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296 (or 2290 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 139488291 is about 11810.5161191203. The cubic root of 139488291 is about 518.6160078569.

The spelling of 139488291 in words is "one hundred thirty-nine million, four hundred eighty-eight thousand, two hundred ninety-one".