139872538 has 16 divisors (see below), whose sum is σ = 226182600. Its totient is φ = 64489536.

The previous prime is 139872529. The next prime is 139872541. The reversal of 139872538 is 835278931.

It can be written as a sum of positive squares in 4 ways, for example, as 71859529 + 68013009 = 8477^2 + 8247^2 .

It is a super-2 number, since 2×139872538² = 39128653773122888, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29988 + ... + 34336.

Almost surely, 2^139872538 is an apocalyptic number.

139872538 is a deficient number, since it is larger than the sum of its proper divisors (86310062).

139872538 is a wasteful number, since it uses less digits than its factorization.

139872538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5601.

The product of its digits is 362880, while the sum is 46.

The square root of 139872538 is about 11826.7720870912. The cubic root of 139872538 is about 519.0917800322.

The spelling of 139872538 in words is "one hundred thirty-nine million, eight hundred seventy-two thousand, five hundred thirty-eight".