16218864 has 120 divisors (see below), whose sum is σ = 48746880. Its totient is φ = 5022336.

The previous prime is 16218857. The next prime is 16218871. The reversal of 16218864 is 46881261.

It is an interprime number because it is at equal distance from previous prime (16218857) and next prime (16218871).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195367 + ... + 195449.

It is an arithmetic number, because the mean of its divisors is an integer number (406224).

Almost surely, 2^16218864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16218864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24373440).

16218864 is an abundant number, since it is smaller than the sum of its proper divisors (32528016).

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

16218864 is a wasteful number, since it uses less digits than its factorization.

16218864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 170 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 16218864 is about 4027.2650769474. The cubic root of 16218864 is about 253.1279745421.

The spelling of 16218864 in words is "sixteen million, two hundred eighteen thousand, eight hundred sixty-four".