18858940 has 24 divisors (see below), whose sum is σ = 40526640. Its totient is φ = 7367808.

The previous prime is 18858929. The next prime is 18858947. The reversal of 18858940 is 4985881.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10105 + ... + 11824.

It is an arithmetic number, because the mean of its divisors is an integer number (1688610).

Almost surely, 2^18858940 is an apocalyptic number.

18858940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18858940 is an abundant number, since it is smaller than the sum of its proper divisors (21667700).

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

18858940 is a wasteful number, since it uses less digits than its factorization.

18858940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21981 (or 21979 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 18858940 is about 4342.6881076126. The cubic root of 18858940 is about 266.1781646961.

The spelling of 18858940 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred forty".