139875831 has 6 divisors (see below), whose sum is σ = 202042880. Its totient is φ = 93250548.

The previous prime is 139875829. The next prime is 139875889. The reversal of 139875831 is 138578931.

It is not a de Polignac number, because 139875831 - 2¹ = 139875829 is a prime.

It is a super-2 number, since 2×139875831² = 39130496195881122, 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 (139875821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7770871 + ... + 7770888.

Almost surely, 2^139875831 is an apocalyptic number.

139875831 is a deficient number, since it is larger than the sum of its proper divisors (62167049).

139875831 is a wasteful number, since it uses less digits than its factorization.

139875831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15541765 (or 15541762 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 139875831 is about 11826.9113043093. The cubic root of 139875831 is about 519.0958536357.

The spelling of 139875831 in words is "one hundred thirty-nine million, eight hundred seventy-five thousand, eight hundred thirty-one".