18000870 has 32 divisors (see below), whose sum is σ = 44372448. Its totient is φ = 4670208.

The previous prime is 18000869. The next prime is 18000877. The reversal of 18000870 is 7800081.

It is a self number, because there is not a number n which added to its sum of digits gives 18000870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000877) 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 15 ways as a sum of consecutive naturals, for example, 6999 + ... + 9218.

It is an arithmetic number, because the mean of its divisors is an integer number (1386639).

Almost surely, 2^18000870 is an apocalyptic number.

18000870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18000870 is an abundant number, since it is smaller than the sum of its proper divisors (26371578).

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

18000870 is a wasteful number, since it uses less digits than its factorization.

18000870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16264.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18000870 is about 4242.7432163637. The cubic root of 18000870 is about 262.0783616584.

The spelling of 18000870 in words is "eighteen million, eight hundred seventy", and thus it is an aban number.