18913472 has 28 divisors (see below), whose sum is σ = 38746176. Its totient is φ = 9150720.

The previous prime is 18913471. The next prime is 18913487. The reversal of 18913472 is 27431981.

It is not an unprimeable number, because it can be changed into a prime (18913471) by changing a digit.

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, 2783 + ... + 6750.

It is an arithmetic number, because the mean of its divisors is an integer number (1383792).

Almost surely, 2^18913472 is an apocalyptic number.

It is an amenable number.

18913472 is an abundant number, since it is smaller than the sum of its proper divisors (19832704).

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

18913472 is an equidigital number, since it uses as much as digits as its factorization.

18913472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9576 (or 9566 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 18913472 is about 4348.9621750482. The cubic root of 18913472 is about 266.4344756640.

The spelling of 18913472 in words is "eighteen million, nine hundred thirteen thousand, four hundred seventy-two".