18099712 has 80 divisors (see below), whose sum is σ = 39774240. Its totient is φ = 8200192.

The previous prime is 18099671. The next prime is 18099721. The reversal of 18099712 is 21799081.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 341478 + ... + 341530.

It is an arithmetic number, because the mean of its divisors is an integer number (497178).

Almost surely, 2^18099712 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 18099712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19887120).

18099712 is an abundant number, since it is smaller than the sum of its proper divisors (21674528).

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

18099712 is an equidigital number, since it uses as much as digits as its factorization.

18099712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18099712 is about 4254.3756298663. The cubic root of 18099712 is about 262.5571733364.

The spelling of 18099712 in words is "eighteen million, ninety-nine thousand, seven hundred twelve".