18398234 has 4 divisors (see below), whose sum is σ = 27597354. Its totient is φ = 9199116.

The previous prime is 18398227. The next prime is 18398257. The reversal of 18398234 is 43289381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43289381 = 23 ⋅1882147.

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 7155625 = 3353^2 + 2675^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4599557 + ... + 4599560.

Almost surely, 2^18398234 is an apocalyptic number.

18398234 is a deficient number, since it is larger than the sum of its proper divisors (9199120).

18398234 is an equidigital number, since it uses as much as digits as its factorization.

18398234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9199119.

The product of its digits is 41472, while the sum is 38.

The square root of 18398234 is about 4289.3162625295. The cubic root of 18398234 is about 263.9927779628.

The spelling of 18398234 in words is "eighteen million, three hundred ninety-eight thousand, two hundred thirty-four".