19979445 has 16 divisors (see below), whose sum is σ = 32832000. Its totient is φ = 10367424.

The previous prime is 19979441. The next prime is 19979459. The reversal of 19979445 is 54497991.

It is not a de Polignac number, because 19979445 - 2² = 19979441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19979394 and 19979403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979441) 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, 17445 + ... + 18554.

It is an arithmetic number, because the mean of its divisors is an integer number (2052000).

Almost surely, 2^19979445 is an apocalyptic number.

19979445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19979445 is a deficient number, since it is larger than the sum of its proper divisors (12852555).

19979445 is a wasteful number, since it uses less digits than its factorization.

19979445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36044.

The product of its digits is 408240, while the sum is 48.

The square root of 19979445 is about 4469.8372453592. The cubic root of 19979445 is about 271.3487383605.

The spelling of 19979445 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred forty-five".