18390873 has 8 divisors (see below), whose sum is σ = 24612736. Its totient is φ = 12214800.

The previous prime is 18390857. The next prime is 18390877. The reversal of 18390873 is 37809381.

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

It is not a de Polignac number, because 18390873 - 2⁴ = 18390857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18390877) 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, 10498 + ... + 12123.

It is an arithmetic number, because the mean of its divisors is an integer number (3076592).

Almost surely, 2^18390873 is an apocalyptic number.

It is an amenable number.

18390873 is a deficient number, since it is larger than the sum of its proper divisors (6221863).

18390873 is a wasteful number, since it uses less digits than its factorization.

18390873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22895.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 18390873 is about 4288.4581145209. The cubic root of 18390873 is about 263.9575660677.

The spelling of 18390873 in words is "eighteen million, three hundred ninety thousand, eight hundred seventy-three".