139725431 has 24 divisors (see below), whose sum is σ = 155391120. Its totient is φ = 125494272.

The previous prime is 139725419. The next prime is 139725479. The reversal of 139725431 is 134527931.

It is not a de Polignac number, because 139725431 - 2⁶ = 139725367 is a prime.

It is a super-2 number, since 2×139725431² = 39046392136271522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139725391 and 139725400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139725931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 780500 + ... + 780678.

It is an arithmetic number, because the mean of its divisors is an integer number (6474630).

Almost surely, 2^139725431 is an apocalyptic number.

139725431 is a deficient number, since it is larger than the sum of its proper divisors (15665689).

139725431 is a wasteful number, since it uses less digits than its factorization.

139725431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 306 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 139725431 is about 11820.5512138817. The cubic root of 139725431 is about 518.9097361471.

The spelling of 139725431 in words is "one hundred thirty-nine million, seven hundred twenty-five thousand, four hundred thirty-one".