18864744 has 16 divisors (see below), whose sum is σ = 47161920. Its totient is φ = 6288240.

The previous prime is 18864743. The next prime is 18864749. The reversal of 18864744 is 44746881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18864696 and 18864705.

It is not an unprimeable number, because it can be changed into a prime (18864743) 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, 392992 + ... + 393039.

It is an arithmetic number, because the mean of its divisors is an integer number (2947620).

Almost surely, 2^18864744 is an apocalyptic number.

It is an amenable number.

18864744 is an abundant number, since it is smaller than the sum of its proper divisors (28297176).

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

18864744 is a wasteful number, since it uses less digits than its factorization.

18864744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786040 (or 786036 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 18864744 is about 4343.3563058999. The cubic root of 18864744 is about 266.2054680972.

The spelling of 18864744 in words is "eighteen million, eight hundred sixty-four thousand, seven hundred forty-four".