18397284 has 12 divisors (see below), whose sum is σ = 42927024. Its totient is φ = 6132424.

The previous prime is 18397273. The next prime is 18397333. The reversal of 18397284 is 48279381.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766542 + ... + 766565.

It is an arithmetic number, because the mean of its divisors is an integer number (3577252).

Almost surely, 2^18397284 is an apocalyptic number.

It is an amenable number.

18397284 is an abundant number, since it is smaller than the sum of its proper divisors (24529740).

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

18397284 is a wasteful number, since it uses less digits than its factorization.

18397284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533114 (or 1533112 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 18397284 is about 4289.2055208395. The cubic root of 18397284 is about 263.9882340945.

It can be divided in two parts, 18397 and 284, that added together give a palindrome (18681).

The spelling of 18397284 in words is "eighteen million, three hundred ninety-seven thousand, two hundred eighty-four".