139712431 has 4 divisors (see below), whose sum is σ = 139917672. Its totient is φ = 139507192.

The previous prime is 139712423. The next prime is 139712471. The reversal of 139712431 is 134217931.

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 139712431 - 2³ = 139712423 is a prime.

It is a super-2 number, since 2×139712431² = 39039126751859522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139712393 and 139712402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139712411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101596 + ... + 102961.

It is an arithmetic number, because the mean of its divisors is an integer number (34979418).

Almost surely, 2^139712431 is an apocalyptic number.

139712431 is a deficient number, since it is larger than the sum of its proper divisors (205241).

139712431 is an equidigital number, since it uses as much as digits as its factorization.

139712431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205240.

The product of its digits is 4536, while the sum is 31.

The square root of 139712431 is about 11820.0013113366. The cubic root of 139712431 is about 518.8936425944.

Subtracting from 139712431 its sum of digits (31), we obtain a square (139712400 = 11820²).

The spelling of 139712431 in words is "one hundred thirty-nine million, seven hundred twelve thousand, four hundred thirty-one".