18390238 has 8 divisors (see below), whose sum is σ = 27853488. Its totient is φ = 9105744.

The previous prime is 18390199. The next prime is 18390257. The reversal of 18390238 is 83209381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

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 3 ways as a sum of consecutive naturals, for example, 44431 + ... + 44842.

It is an arithmetic number, because the mean of its divisors is an integer number (3481686).

Almost surely, 2^18390238 is an apocalyptic number.

18390238 is a deficient number, since it is larger than the sum of its proper divisors (9463250).

18390238 is a wasteful number, since it uses less digits than its factorization.

18390238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89378.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18390238 is about 4288.3840779482. The cubic root of 18390238 is about 263.9545280575.

The spelling of 18390238 in words is "eighteen million, three hundred ninety thousand, two hundred thirty-eight".