18853840 has 20 divisors (see below), whose sum is σ = 43835364. Its totient is φ = 7541504.

The previous prime is 18853811. The next prime is 18853847. The reversal of 18853840 is 4835881.

It can be written as a sum of positive squares in 2 ways, for example, as 8042896 + 10810944 = 2836^2 + 3288^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 18853840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18853847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117757 + ... + 117916.

Almost surely, 2^18853840 is an apocalyptic number.

18853840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18853840 is an abundant number, since it is smaller than the sum of its proper divisors (24981524).

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

18853840 is a wasteful number, since it uses less digits than its factorization.

18853840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235686 (or 235680 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 18853840 is about 4342.1008740010. The cubic root of 18853840 is about 266.1541684547.

The spelling of 18853840 in words is "eighteen million, eight hundred fifty-three thousand, eight hundred forty".