18864330 has 16 divisors (see below), whose sum is σ = 45274464. Its totient is φ = 5030480.

The previous prime is 18864281. The next prime is 18864341. The reversal of 18864330 is 3346881.

It is a junction number, because it is equal to n+sod(n) for n = 18864291 and 18864300.

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, 314376 + ... + 314435.

It is an arithmetic number, because the mean of its divisors is an integer number (2829654).

Almost surely, 2^18864330 is an apocalyptic number.

18864330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18864330 is an abundant number, since it is smaller than the sum of its proper divisors (26410134).

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

18864330 is a wasteful number, since it uses less digits than its factorization.

18864330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628821.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18864330 is about 4343.3086466426. The cubic root of 18864330 is about 266.2035207279.

It can be divided in two parts, 1886 and 4330, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 18864330 in words is "eighteen million, eight hundred sixty-four thousand, three hundred thirty".