18338330 has 16 divisors (see below), whose sum is σ = 33462504. Its totient is φ = 7234560.

The previous prime is 18338323. The next prime is 18338381. The reversal of 18338330 is 3383381.

It can be written as a sum of positive squares in 4 ways, for example, as 14830201 + 3508129 = 3851^2 + 1873^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18338293 and 18338302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11831 + ... + 13290.

Almost surely, 2^18338330 is an apocalyptic number.

18338330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18338330 is a deficient number, since it is larger than the sum of its proper divisors (15124174).

18338330 is a wasteful number, since it uses less digits than its factorization.

18338330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25201.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 18338330 is about 4282.3276380959. The cubic root of 18338330 is about 263.7059493827.

The spelling of 18338330 in words is "eighteen million, three hundred thirty-eight thousand, three hundred thirty".