19979472 has 20 divisors (see below), whose sum is σ = 51613760. Its totient is φ = 6659808.

The previous prime is 19979459. The next prime is 19979473. The reversal of 19979472 is 27497991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 416239 = 19979472 / (1 + 9 + 9 + 7 + 9 + 4 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979473) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 208072 + ... + 208167.

It is an arithmetic number, because the mean of its divisors is an integer number (2580688).

Almost surely, 2^19979472 is an apocalyptic number.

19979472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19979472 is an abundant number, since it is smaller than the sum of its proper divisors (31634288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19979472 is a wasteful number, since it uses less digits than its factorization.

19979472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416250 (or 416244 counting only the distinct ones).

The product of its digits is 285768, while the sum is 48.

The square root of 19979472 is about 4469.8402656023. The cubic root of 19979472 is about 271.3488605930.

The spelling of 19979472 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred seventy-two".