19499972 has 24 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 9397856.

The previous prime is 19499959. The next prime is 19499983. The reversal of 19499972 is 27999491.

It is a self number, because there is not a number n which added to its sum of digits gives 19499972.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11729 + ... + 13287.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^19499972 is an apocalyptic number.

It is an amenable number.

19499972 is a deficient number, since it is larger than the sum of its proper divisors (15880828).

19499972 is a wasteful number, since it uses less digits than its factorization.

19499972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1673 counting only the distinct ones).

The product of its digits is 367416, while the sum is 50.

The square root of 19499972 is about 4415.8772627871. The cubic root of 19499972 is about 269.1605017753.

The spelling of 19499972 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred seventy-two".