18423140 has 12 divisors (see below), whose sum is σ = 38688636. Its totient is φ = 7369248.

The previous prime is 18423137. The next prime is 18423157. The reversal of 18423140 is 4132481.

It can be written as a sum of positive squares in 2 ways, for example, as 7873636 + 10549504 = 2806^2 + 3248^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460559 + ... + 460598.

It is an arithmetic number, because the mean of its divisors is an integer number (3224053).

Almost surely, 2^18423140 is an apocalyptic number.

18423140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18423140 is an abundant number, since it is smaller than the sum of its proper divisors (20265496).

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

18423140 is a wasteful number, since it uses less digits than its factorization.

18423140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921166 (or 921164 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18423140 is about 4292.2185405685. The cubic root of 18423140 is about 264.1118480768. Note that the first 3 decimals are identical.

The spelling of 18423140 in words is "eighteen million, four hundred twenty-three thousand, one hundred forty".