19404872 has 16 divisors (see below), whose sum is σ = 37368060. Its totient is φ = 9440064.

The previous prime is 19404863. The next prime is 19404881. The reversal of 19404872 is 27840491.

It is an interprime number because it is at equal distance from previous prime (19404863) and next prime (19404881).

It can be written as a sum of positive squares in 2 ways, for example, as 17255716 + 2149156 = 4154^2 + 1466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32483 + ... + 33074.

Almost surely, 2^19404872 is an apocalyptic number.

It is an amenable number.

19404872 is a deficient number, since it is larger than the sum of its proper divisors (17963188).

19404872 is a wasteful number, since it uses less digits than its factorization.

19404872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65600 (or 65596 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 19404872 is about 4405.0961397000. The cubic root of 19404872 is about 268.7222295444.

The spelling of 19404872 in words is "nineteen million, four hundred four thousand, eight hundred seventy-two".