139831431 has 8 divisors (see below), whose sum is σ = 196254720. Its totient is φ = 88314552.

The previous prime is 139831429. The next prime is 139831453. The reversal of 139831431 is 134138931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139831431 - 2¹ = 139831429 is a prime.

It is a super-2 number, since 2×139831431² = 39105658191015522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139831392 and 139831401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139831831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226535 + ... + 1226648.

It is an arithmetic number, because the mean of its divisors is an integer number (24531840).

Almost surely, 2^139831431 is an apocalyptic number.

139831431 is a deficient number, since it is larger than the sum of its proper divisors (56423289).

139831431 is a wasteful number, since it uses less digits than its factorization.

139831431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453205.

The product of its digits is 7776, while the sum is 33.

The square root of 139831431 is about 11825.0340802892. The cubic root of 139831431 is about 519.0409232621.

The spelling of 139831431 in words is "one hundred thirty-nine million, eight hundred thirty-one thousand, four hundred thirty-one".