18851940 has 96 divisors (see below), whose sum is σ = 59512320. Its totient is φ = 5015520.

The previous prime is 18851939. The next prime is 18851951. The reversal of 18851940 is 4915881.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18851895 and 18851904.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43525 + ... + 43955.

It is an arithmetic number, because the mean of its divisors is an integer number (619920).

Almost surely, 2^18851940 is an apocalyptic number.

18851940 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 18851940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29756160).

18851940 is an abundant number, since it is smaller than the sum of its proper divisors (40660380).

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

18851940 is an equidigital number, since it uses as much as digits as its factorization.

18851940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18851940 is about 4341.8820803886. The cubic root of 18851940 is about 266.1452275721.

It can be divided in two parts, 18851 and 940, that added together give a palindrome (19791).

The spelling of 18851940 in words is "eighteen million, eight hundred fifty-one thousand, nine hundred forty".