18385940 has 24 divisors (see below), whose sum is σ = 39510240. Its totient is φ = 7183008.

The previous prime is 18385931. The next prime is 18385951. The reversal of 18385940 is 4958381.

It is a Smith number, since the sum of its digits (38) 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 = 18385894 and 18385903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9830 + ... + 11549.

It is an arithmetic number, because the mean of its divisors is an integer number (1646260).

Almost surely, 2^18385940 is an apocalyptic number.

18385940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18385940 is an abundant number, since it is smaller than the sum of its proper divisors (21124300).

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

18385940 is a wasteful number, since it uses less digits than its factorization.

18385940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21431 (or 21429 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18385940 is about 4287.8829275063. The cubic root of 18385940 is about 263.9339634341.

The spelling of 18385940 in words is "eighteen million, three hundred eighty-five thousand, nine hundred forty".