18855940 has 48 divisors (see below), whose sum is σ = 41291712. Its totient is φ = 7226496.

The previous prime is 18855937. The next prime is 18855953. The reversal of 18855940 is 4955881.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18855893 and 18855902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61267 + ... + 61573.

It is an arithmetic number, because the mean of its divisors is an integer number (860244).

Almost surely, 2^18855940 is an apocalyptic number.

18855940 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 18855940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20645856).

18855940 is an abundant number, since it is smaller than the sum of its proper divisors (22435772).

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

18855940 is a wasteful number, since it uses less digits than its factorization.

18855940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 18855940 is about 4342.3426856940. The cubic root of 18855940 is about 266.1640497840.

The spelling of 18855940 in words is "eighteen million, eight hundred fifty-five thousand, nine hundred forty".