18240858 has 24 divisors (see below), whose sum is σ = 40442688. Its totient is φ = 5938632.

The previous prime is 18240857. The next prime is 18240869. The reversal of 18240858 is 85804281.

It is not an unprimeable number, because it can be changed into a prime (18240857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11010 + ... + 12557.

It is an arithmetic number, because the mean of its divisors is an integer number (1685112).

Almost surely, 2^18240858 is an apocalyptic number.

18240858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18240858 is an abundant number, since it is smaller than the sum of its proper divisors (22201830).

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

18240858 is a wasteful number, since it uses less digits than its factorization.

18240858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23618 (or 23615 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 18240858 is about 4270.9317484596. The cubic root of 18240858 is about 263.2379020043.

The spelling of 18240858 in words is "eighteen million, two hundred forty thousand, eight hundred fifty-eight".