18909358 has 32 divisors (see below), whose sum is σ = 32288256. Its totient is φ = 8239968.

The previous prime is 18909353. The next prime is 18909377. The reversal of 18909358 is 85390981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61441 + ... + 61747.

It is an arithmetic number, because the mean of its divisors is an integer number (1009008).

Almost surely, 2^18909358 is an apocalyptic number.

18909358 is a deficient number, since it is larger than the sum of its proper divisors (13378898).

18909358 is a wasteful number, since it uses less digits than its factorization.

18909358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18909358 is about 4348.4891629162. The cubic root of 18909358 is about 266.4151562618.

The spelling of 18909358 in words is "eighteen million, nine hundred nine thousand, three hundred fifty-eight".