139243239 has 32 divisors (see below), whose sum is σ = 214905600. Its totient is φ = 88996320.

The previous prime is 139243231. The next prime is 139243241. The reversal of 139243239 is 932342931.

It is not a de Polignac number, because 139243239 - 2³ = 139243231 is a prime.

It is a super-2 number, since 2×139243239² = 38777359214422242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139243231) 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, 127084 + ... + 128174.

It is an arithmetic number, because the mean of its divisors is an integer number (6715800).

Almost surely, 2^139243239 is an apocalyptic number.

139243239 is a deficient number, since it is larger than the sum of its proper divisors (75662361).

139243239 is a wasteful number, since it uses less digits than its factorization.

139243239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1286 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 139243239 is about 11800.1372449646. The cubic root of 139243239 is about 518.3121295788.

The spelling of 139243239 in words is "one hundred thirty-nine million, two hundred forty-three thousand, two hundred thirty-nine".