18439946 has 16 divisors (see below), whose sum is σ = 32046144. Its totient is φ = 7794144.

The previous prime is 18439921. The next prime is 18439961. The reversal of 18439946 is 64993481.

It is a junction number, because it is equal to n+sod(n) for n = 18439897 and 18439906.

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, 8000 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (2002884).

Almost surely, 2^18439946 is an apocalyptic number.

18439946 is a deficient number, since it is larger than the sum of its proper divisors (13606198).

18439946 is a wasteful number, since it uses less digits than its factorization.

18439946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18125.

The product of its digits is 186624, while the sum is 44.

The square root of 18439946 is about 4294.1758231353. The cubic root of 18439946 is about 264.1921332457.

The spelling of 18439946 in words is "eighteen million, four hundred thirty-nine thousand, nine hundred forty-six".