19979625 has 16 divisors (see below), whose sum is σ = 33246720. Its totient is φ = 10655600.

The previous prime is 19979611. The next prime is 19979627. The reversal of 19979625 is 52697991.

It is not a de Polignac number, because 19979625 - 2⁷ = 19979497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19979627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26265 + ... + 27014.

It is an arithmetic number, because the mean of its divisors is an integer number (2077920).

Almost surely, 2^19979625 is an apocalyptic number.

19979625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19979625 is a deficient number, since it is larger than the sum of its proper divisors (13267095).

19979625 is an equidigital number, since it uses as much as digits as its factorization.

19979625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53297 (or 53287 counting only the distinct ones).

The product of its digits is 306180, while the sum is 48.

The square root of 19979625 is about 4469.8573802751. The cubic root of 19979625 is about 271.3495532417.

The spelling of 19979625 in words is "nineteen million, nine hundred seventy-nine thousand, six hundred twenty-five".