18216464 has 40 divisors (see below), whose sum is σ = 41330688. Its totient is φ = 7614720.

The previous prime is 18216463. The next prime is 18216509. The reversal of 18216464 is 46461281.

It is a self number, because there is not a number n which added to its sum of digits gives 18216464.

It is not an unprimeable number, because it can be changed into a prime (18216463) by changing a digit.

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, 2609 + ... + 6575.

Almost surely, 2^18216464 is an apocalyptic number.

18216464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18216464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20665344).

18216464 is an abundant number, since it is smaller than the sum of its proper divisors (23114224).

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

18216464 is a wasteful number, since it uses less digits than its factorization.

18216464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023 (or 4017 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 18216464 is about 4268.0749759113. The cubic root of 18216464 is about 263.1205045657.

The spelling of 18216464 in words is "eighteen million, two hundred sixteen thousand, four hundred sixty-four".