18390268 has 24 divisors (see below), whose sum is σ = 34821360. Its totient is φ = 8448000.

The previous prime is 18390257. The next prime is 18390287. The reversal of 18390268 is 86209381.

It is a super-2 number, since 2×18390268² = 676403914223648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12348 + ... + 13756.

It is an arithmetic number, because the mean of its divisors is an integer number (1450890).

Almost surely, 2^18390268 is an apocalyptic number.

It is an amenable number.

18390268 is a deficient number, since it is larger than the sum of its proper divisors (16431092).

18390268 is a wasteful number, since it uses less digits than its factorization.

18390268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18390268 is about 4288.3875757678. The cubic root of 18390268 is about 263.9546715871.

It can be divided in two parts, 18 and 390268, that added together give a triangular number (390286 = T₈₈₃).

The spelling of 18390268 in words is "eighteen million, three hundred ninety thousand, two hundred sixty-eight".