16139979 has 20 divisors (see below), whose sum is σ = 24945360. Its totient is φ = 10387440.

The previous prime is 16139971. The next prime is 16139983. The reversal of 16139979 is 97993161.

It is not a de Polignac number, because 16139979 - 2³ = 16139971 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16139971) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1087 + ... + 5784.

It is an arithmetic number, because the mean of its divisors is an integer number (1247268).

Almost surely, 2^16139979 is an apocalyptic number.

16139979 is a deficient number, since it is larger than the sum of its proper divisors (8805381).

16139979 is an equidigital number, since it uses as much as digits as its factorization.

16139979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912 (or 6903 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 16139979 is about 4017.4592717288. The cubic root of 16139979 is about 252.7169210643.

The spelling of 16139979 in words is "sixteen million, one hundred thirty-nine thousand, nine hundred seventy-nine".