139427631 has 12 divisors (see below), whose sum is σ = 230166352. Its totient is φ = 79672896.

The previous prime is 139427611. The next prime is 139427663. The reversal of 139427631 is 136724931.

139427631 is a `hidden beast` number, since 13 + 9 + 4 + 2 + 7 + 631 = 666.

It is not a de Polignac number, because 139427631 - 2¹⁸ = 139165487 is a prime.

It is a super-2 number, since 2×139427631² = 38880128572544322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139427611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1106506 + ... + 1106631.

Almost surely, 2^139427631 is an apocalyptic number.

139427631 is a deficient number, since it is larger than the sum of its proper divisors (90738721).

139427631 is a wasteful number, since it uses less digits than its factorization.

139427631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213150 (or 2213147 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 139427631 is about 11807.9477895187. The cubic root of 139427631 is about 518.5408192080.

The spelling of 139427631 in words is "one hundred thirty-nine million, four hundred twenty-seven thousand, six hundred thirty-one".