18439746 has 16 divisors (see below), whose sum is σ = 39716544. Its totient is φ = 5673744.

The previous prime is 18439739. The next prime is 18439777. The reversal of 18439746 is 64793481.

It is a junction number, because it is equal to n+sod(n) for n = 18439698 and 18439707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118126 + ... + 118281.

It is an arithmetic number, because the mean of its divisors is an integer number (2482284).

Almost surely, 2^18439746 is an apocalyptic number.

18439746 is an abundant number, since it is smaller than the sum of its proper divisors (21276798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18439746 is a wasteful number, since it uses less digits than its factorization.

18439746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236425.

The product of its digits is 145152, while the sum is 42.

The square root of 18439746 is about 4294.1525357164. The cubic root of 18439746 is about 264.1911780980.

The spelling of 18439746 in words is "eighteen million, four hundred thirty-nine thousand, seven hundred forty-six".