19799972 has 12 divisors (see below), whose sum is σ = 35387520. Its totient is φ = 9689256.

The previous prime is 19799971. The next prime is 19799977. The reversal of 19799972 is 27999791.

It is not an unprimeable number, because it can be changed into a prime (19799971) 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 3 ways as a sum of consecutive naturals, for example, 52472 + ... + 52847.

It is an arithmetic number, because the mean of its divisors is an integer number (2948960).

Almost surely, 2^19799972 is an apocalyptic number.

It is an amenable number.

19799972 is a deficient number, since it is larger than the sum of its proper divisors (15587548).

19799972 is a wasteful number, since it uses less digits than its factorization.

19799972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105370 (or 105368 counting only the distinct ones).

The product of its digits is 642978, while the sum is 53.

The square root of 19799972 is about 4449.7159459903. The cubic root of 19799972 is about 270.5337953751.

The spelling of 19799972 in words is "nineteen million, seven hundred ninety-nine thousand, nine hundred seventy-two".