18338458 has 16 divisors (see below), whose sum is σ = 29740320. Its totient is φ = 8451216.

The previous prime is 18338417. The next prime is 18338459. The reversal of 18338458 is 85483381.

It is a self number, because there is not a number n which added to its sum of digits gives 18338458.

It is not an unprimeable number, because it can be changed into a prime (18338459) by changing a digit.

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, 5116 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (1858770).

Almost surely, 2^18338458 is an apocalyptic number.

18338458 is a deficient number, since it is larger than the sum of its proper divisors (11401862).

18338458 is a wasteful number, since it uses less digits than its factorization.

18338458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13101.

The product of its digits is 92160, while the sum is 40.

The square root of 18338458 is about 4282.3425832131. The cubic root of 18338458 is about 263.7065629298.

The spelling of 18338458 in words is "eighteen million, three hundred thirty-eight thousand, four hundred fifty-eight".