18423986 has 16 divisors (see below), whose sum is σ = 31911936. Its totient is φ = 7814016.

The previous prime is 18423967. The next prime is 18424027. The reversal of 18423986 is 68932481.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5426 + ... + 8141.

It is an arithmetic number, because the mean of its divisors is an integer number (1994496).

Almost surely, 2^18423986 is an apocalyptic number.

18423986 is a deficient number, since it is larger than the sum of its proper divisors (13487950).

18423986 is a wasteful number, since it uses less digits than its factorization.

18423986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13673.

The product of its digits is 82944, while the sum is 41.

The square root of 18423986 is about 4292.3170898712. The cubic root of 18423986 is about 264.1158907319.

The spelling of 18423986 in words is "eighteen million, four hundred twenty-three thousand, nine hundred eighty-six".