18389494 has 8 divisors (see below), whose sum is σ = 27715608. Its totient is φ = 9150960.

The previous prime is 18389471. The next prime is 18389513. The reversal of 18389494 is 49498381.

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

It is an alternating number because its digits alternate between odd and even.

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, 21367 + ... + 22210.

It is an arithmetic number, because the mean of its divisors is an integer number (3464451).

Almost surely, 2^18389494 is an apocalyptic number.

18389494 is a deficient number, since it is larger than the sum of its proper divisors (9326114).

18389494 is a wasteful number, since it uses less digits than its factorization.

18389494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43790.

The product of its digits is 248832, while the sum is 46.

The square root of 18389494 is about 4288.2973311094. The cubic root of 18389494 is about 263.9509684730.

The spelling of 18389494 in words is "eighteen million, three hundred eighty-nine thousand, four hundred ninety-four".