18806840 has 64 divisors (see below), whose sum is σ = 46418400. Its totient is φ = 6815232.

The previous prime is 18806831. The next prime is 18806861. The reversal of 18806840 is 4860881.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18806840.

It is a congruent number.

It is an unprimeable number.

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, 30374 + ... + 30986.

Almost surely, 2^18806840 is an apocalyptic number.

18806840 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 18806840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23209200).

18806840 is an abundant number, since it is smaller than the sum of its proper divisors (27611560).

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

18806840 is a wasteful number, since it uses less digits than its factorization.

18806840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 18806840 is about 4336.6853701877. The cubic root of 18806840 is about 265.9328226539.

The spelling of 18806840 in words is "eighteen million, eight hundred six thousand, eight hundred forty".