18406864 has 40 divisors (see below), whose sum is σ = 41068800. Its totient is φ = 7828608.

The previous prime is 18406859. The next prime is 18406897. The reversal of 18406864 is 46860481.

It is a congruent number.

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, 16137 + ... + 17239.

It is an arithmetic number, because the mean of its divisors is an integer number (1026720).

Almost surely, 2^18406864 is an apocalyptic number.

18406864 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 18406864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20534400).

18406864 is an abundant number, since it is smaller than the sum of its proper divisors (22661936).

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

18406864 is a wasteful number, since it uses less digits than its factorization.

18406864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 18406864 is about 4290.3221324278. The cubic root of 18406864 is about 264.0340482563.

The spelling of 18406864 in words is "eighteen million, four hundred six thousand, eight hundred sixty-four".