19109979 has 16 divisors (see below), whose sum is σ = 32355840. Its totient is φ = 10919880.

The previous prime is 19109971. The next prime is 19109983. The reversal of 19109979 is 97990191.

It is not a de Polignac number, because 19109979 - 2³ = 19109971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19109971) 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, 50367 + ... + 50744.

It is an arithmetic number, because the mean of its divisors is an integer number (2022240).

Almost surely, 2^19109979 is an apocalyptic number.

19109979 is a deficient number, since it is larger than the sum of its proper divisors (13245861).

19109979 is a wasteful number, since it uses less digits than its factorization.

19109979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101127 (or 101121 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 19109979 is about 4371.4961969559. The cubic root of 19109979 is about 267.3540310562.

The spelling of 19109979 in words is "nineteen million, one hundred nine thousand, nine hundred seventy-nine".