18845472 has 24 divisors (see below), whose sum is σ = 49469616. Its totient is φ = 6281792.

The previous prime is 18845419. The next prime is 18845479. The reversal of 18845472 is 27454881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18845472.

It is not an unprimeable number, because it can be changed into a prime (18845479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98058 + ... + 98249.

It is an arithmetic number, because the mean of its divisors is an integer number (2061234).

Almost surely, 2^18845472 is an apocalyptic number.

18845472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18845472 is an abundant number, since it is smaller than the sum of its proper divisors (30624144).

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

18845472 is a wasteful number, since it uses less digits than its factorization.

18845472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196320 (or 196312 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 18845472 is about 4341.1371782057. The cubic root of 18845472 is about 266.1147864214.

The spelling of 18845472 in words is "eighteen million, eight hundred forty-five thousand, four hundred seventy-two".