139879538 has 6 divisors (see below), whose sum is σ = 209844399. Its totient is φ = 69931406.

The previous prime is 139879511. The next prime is 139879541. The reversal of 139879538 is 835978931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 69939769 = 8363^2 + 8363^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8363.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139879538.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12545 + ... + 20907.

Almost surely, 2^139879538 is an apocalyptic number.

139879538 is a deficient number, since it is larger than the sum of its proper divisors (69964861).

139879538 is an frugal number, since it uses more digits than its factorization.

139879538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16728 (or 8365 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 139879538 is about 11827.0680221262. The cubic root of 139879538 is about 519.1004393013.

The spelling of 139879538 in words is "one hundred thirty-nine million, eight hundred seventy-nine thousand, five hundred thirty-eight".