18474912 has 48 divisors (see below), whose sum is σ = 53887680. Its totient is φ = 6158016.

The previous prime is 18474889. The next prime is 18474917. The reversal of 18474912 is 21947481.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18474917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9828 + ... + 11555.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^18474912 is an apocalyptic number.

18474912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18474912 is an abundant number, since it is smaller than the sum of its proper divisors (35412768).

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

18474912 is a wasteful number, since it uses less digits than its factorization.

18474912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21402 (or 21388 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18474912 is about 4298.2452233441. The cubic root of 18474912 is about 264.3590156827.

The spelling of 18474912 in words is "eighteen million, four hundred seventy-four thousand, nine hundred twelve".