18909960 has 64 divisors (see below), whose sum is σ = 58276800. Its totient is φ = 4905216.

The previous prime is 18909949. The next prime is 18909983. The reversal of 18909960 is 6990981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2311 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (910575).

Almost surely, 2^18909960 is an apocalyptic number.

18909960 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 18909960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29138400).

18909960 is an abundant number, since it is smaller than the sum of its proper divisors (39366840).

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

18909960 is a wasteful number, since it uses less digits than its factorization.

18909960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 18909960 is about 4348.5583818088. The cubic root of 18909960 is about 266.4179834373.

The spelling of 18909960 in words is "eighteen million, nine hundred nine thousand, nine hundred sixty".