18918394 has 8 divisors (see below), whose sum is σ = 30957408. Its totient is φ = 8599260.

The previous prime is 18918373. The next prime is 18918413. The reversal of 18918394 is 49381981.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18918394.

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, 429942 + ... + 429985.

It is an arithmetic number, because the mean of its divisors is an integer number (3869676).

Almost surely, 2^18918394 is an apocalyptic number.

18918394 is a deficient number, since it is larger than the sum of its proper divisors (12039014).

18918394 is a wasteful number, since it uses less digits than its factorization.

18918394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859940.

The product of its digits is 62208, while the sum is 43.

The square root of 18918394 is about 4349.5280203719. The cubic root of 18918394 is about 266.4575857650.

The spelling of 18918394 in words is "eighteen million, nine hundred eighteen thousand, three hundred ninety-four".