18706872 has 32 divisors (see below), whose sum is σ = 47335680. Its totient is φ = 6159840.

The previous prime is 18706861. The next prime is 18706873. The reversal of 18706872 is 27860781.

It is a self number, because there is not a number n which added to its sum of digits gives 18706872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18706873) 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 7 ways as a sum of consecutive naturals, for example, 2704 + ... + 6687.

It is an arithmetic number, because the mean of its divisors is an integer number (1479240).

Almost surely, 2^18706872 is an apocalyptic number.

18706872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18706872 is an abundant number, since it is smaller than the sum of its proper divisors (28628808).

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

18706872 is a wasteful number, since it uses less digits than its factorization.

18706872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9483 (or 9479 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 18706872 is about 4325.1441594472. The cubic root of 18706872 is about 265.4607955277.

The spelling of 18706872 in words is "eighteen million, seven hundred six thousand, eight hundred seventy-two".