18399060 has 36 divisors (see below), whose sum is σ = 55811028. Its totient is φ = 4906368.

The previous prime is 18399047. The next prime is 18399067. The reversal of 18399060 is 6099381.

It can be written as a sum of positive squares in 2 ways, for example, as 9326916 + 9072144 = 3054^2 + 3012^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50929 + ... + 51288.

Almost surely, 2^18399060 is an apocalyptic number.

18399060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18399060 is an abundant number, since it is smaller than the sum of its proper divisors (37411968).

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

18399060 is a wasteful number, since it uses less digits than its factorization.

18399060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102232 (or 102227 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 18399060 is about 4289.4125471910. The cubic root of 18399060 is about 263.9967286096.

The spelling of 18399060 in words is "eighteen million, three hundred ninety-nine thousand, sixty".