18023490 has 48 divisors (see below), whose sum is σ = 48904128. Its totient is φ = 4596768.

The previous prime is 18023483. The next prime is 18023491. The reversal of 18023490 is 9432081.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18023491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2284 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (1018836).

Almost surely, 2^18023490 is an apocalyptic number.

18023490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18023490 is an abundant number, since it is smaller than the sum of its proper divisors (30880638).

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

18023490 is a wasteful number, since it uses less digits than its factorization.

18023490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743 (or 8740 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18023490 is about 4245.4081075911. The cubic root of 18023490 is about 262.1880921165.

The spelling of 18023490 in words is "eighteen million, twenty-three thousand, four hundred ninety".