16089979 has 4 divisors (see below), whose sum is σ = 16936840. Its totient is φ = 15243120.

The previous prime is 16089971. The next prime is 16089989. The reversal of 16089979 is 97998061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97998061 = 7 ⋅13999723.

It is a cyclic number.

It is not a de Polignac number, because 16089979 - 2³ = 16089971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16089971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423402 + ... + 423439.

It is an arithmetic number, because the mean of its divisors is an integer number (4234210).

Almost surely, 2^16089979 is an apocalyptic number.

16089979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16089979 is a deficient number, since it is larger than the sum of its proper divisors (846861).

16089979 is an equidigital number, since it uses as much as digits as its factorization.

16089979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846860.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 16089979 is about 4011.2316063773. The cubic root of 16089979 is about 252.4556874171.

The spelling of 16089979 in words is "sixteen million, eighty-nine thousand, nine hundred seventy-nine".