139631687 has 12 divisors (see below), whose sum is σ = 151875360. Its totient is φ = 128314368.

The previous prime is 139631669. The next prime is 139631717. The reversal of 139631687 is 786136931.

It is not a de Polignac number, because 139631687 - 2¹⁰ = 139630663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139631617) 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, 38663 + ... + 42119.

It is an arithmetic number, because the mean of its divisors is an integer number (12656280).

Almost surely, 2^139631687 is an apocalyptic number.

139631687 is a deficient number, since it is larger than the sum of its proper divisors (12243673).

139631687 is a wasteful number, since it uses less digits than its factorization.

139631687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722 (or 3709 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 139631687 is about 11816.5852512475. The cubic root of 139631687 is about 518.7936619368.

The spelling of 139631687 in words is "one hundred thirty-nine million, six hundred thirty-one thousand, six hundred eighty-seven".