18397923 has 8 divisors (see below), whose sum is σ = 24561936. Its totient is φ = 12249600.

The previous prime is 18397921. The next prime is 18397933. The reversal of 18397923 is 32979381.

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

It is not a de Polignac number, because 18397923 - 2¹ = 18397921 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18397921) 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, 838 + ... + 6123.

It is an arithmetic number, because the mean of its divisors is an integer number (3070242).

Almost surely, 2^18397923 is an apocalyptic number.

18397923 is a deficient number, since it is larger than the sum of its proper divisors (6164013).

18397923 is an equidigital number, since it uses as much as digits as its factorization.

18397923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7845.

The product of its digits is 81648, while the sum is 42.

The square root of 18397923 is about 4289.2800095121. The cubic root of 18397923 is about 263.9912904611.

The spelling of 18397923 in words is "eighteen million, three hundred ninety-seven thousand, nine hundred twenty-three".