18361284 has 12 divisors (see below), whose sum is σ = 42843024. Its totient is φ = 6120424.

The previous prime is 18361271. The next prime is 18361289. The reversal of 18361284 is 48216381.

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

It is not an unprimeable number, because it can be changed into a prime (18361289) 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, 765042 + ... + 765065.

It is an arithmetic number, because the mean of its divisors is an integer number (3570252).

Almost surely, 2^18361284 is an apocalyptic number.

It is an amenable number.

18361284 is an abundant number, since it is smaller than the sum of its proper divisors (24481740).

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

18361284 is a wasteful number, since it uses less digits than its factorization.

18361284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530114 (or 1530112 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 18361284 is about 4285.0068844752. The cubic root of 18361284 is about 263.8159300002.

The spelling of 18361284 in words is "eighteen million, three hundred sixty-one thousand, two hundred eighty-four".