18940 has 12 divisors (see below), whose sum is σ = 39816. Its totient is φ = 7568.

The previous prime is 18919. The next prime is 18947. The reversal of 18940 is 4981.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947) 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, 454 + ... + 493.

It is an arithmetic number, because the mean of its divisors is an integer number (3318).

2¹⁸⁹⁴⁰ is an apocalyptic number.

18940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18940 is an abundant number, since it is smaller than the sum of its proper divisors (20876).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19908).

18940 is a wasteful number, since it uses less digits than its factorization.

18940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18940 is about 137.6226725507. The cubic root of 18940 is about 26.6558984301.

The spelling of 18940 in words is "eighteen thousand, nine hundred forty".