18164320 has 48 divisors (see below), whose sum is σ = 43355088. Its totient is φ = 7191040.

The previous prime is 18164281. The next prime is 18164339. The reversal of 18164320 is 2346181.

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, 16590 + ... + 17650.

It is an arithmetic number, because the mean of its divisors is an integer number (903231).

Almost surely, 2^18164320 is an apocalyptic number.

18164320 is a gapful number since it is divisible by the number (10) 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 18164320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21677544).

18164320 is an abundant number, since it is smaller than the sum of its proper divisors (25190768).

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

18164320 is a wasteful number, since it uses less digits than its factorization.

18164320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18164320 is about 4261.9619895067. The cubic root of 18164320 is about 262.8692068457.

It can be divided in two parts, 181643 and 20, that multiplied together give a triangular number (3632860 = T₂₆₉₅).

The spelling of 18164320 in words is "eighteen million, one hundred sixty-four thousand, three hundred twenty".