18439330 has 64 divisors (see below), whose sum is σ = 42674688. Its totient is φ = 5575680.

The previous prime is 18439321. The next prime is 18439349. The reversal of 18439330 is 3393481.

It is a junction number, because it is equal to n+sod(n) for n = 18439292 and 18439301.

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 31 ways as a sum of consecutive naturals, for example, 20490 + ... + 21370.

It is an arithmetic number, because the mean of its divisors is an integer number (666792).

Almost surely, 2^18439330 is an apocalyptic number.

18439330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18439330 is an abundant number, since it is smaller than the sum of its proper divisors (24235358).

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

18439330 is a wasteful number, since it uses less digits than its factorization.

18439330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18439330 is about 4294.1040974806. The cubic root of 18439330 is about 264.1891913686.

It can be divided in two parts, 18439 and 330, that added together give a square (18769 = 137²).

The spelling of 18439330 in words is "eighteen million, four hundred thirty-nine thousand, three hundred thirty".