80139939 has 16 divisors (see below), whose sum is σ = 117604224. Its totient is φ = 48137600.

The previous prime is 80139937. The next prime is 80139947. The reversal of 80139939 is 93993108.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 80139939 - 2¹ = 80139937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80139939.

It is not an unprimeable number, because it can be changed into a prime (80139937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7017 + ... + 14474.

It is an arithmetic number, because the mean of its divisors is an integer number (7350264).

Almost surely, 2^80139939 is an apocalyptic number.

80139939 is a deficient number, since it is larger than the sum of its proper divisors (37464285).

80139939 is a wasteful number, since it uses less digits than its factorization.

80139939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21618.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 80139939 is about 8952.0913199096. The cubic root of 80139939 is about 431.1380328518.

The spelling of 80139939 in words is "eighty million, one hundred thirty-nine thousand, nine hundred thirty-nine".