18120704 has 64 divisors (see below), whose sum is σ = 41942400. Its totient is φ = 7667712.

The previous prime is 18120689. The next prime is 18120719. The reversal of 18120704 is 40702181.

It is an interprime number because it is at equal distance from previous prime (18120689) and next prime (18120719).

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 18120704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229337 + ... + 229415.

It is an arithmetic number, because the mean of its divisors is an integer number (655350).

Almost surely, 2^18120704 is an apocalyptic number.

18120704 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 18120704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20971200).

18120704 is an abundant number, since it is smaller than the sum of its proper divisors (23821696).

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

18120704 is an frugal number, since it uses more digits than its factorization.

18120704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 18120704 is about 4256.8420219689. The cubic root of 18120704 is about 262.6586385011.

Adding to 18120704 its reverse (40702181), we get a palindrome (58822885).

The spelling of 18120704 in words is "eighteen million, one hundred twenty thousand, seven hundred four".