18313263 has 16 divisors (see below), whose sum is σ = 27439200. Its totient is φ = 12070080.

The previous prime is 18313259. The next prime is 18313277. The reversal of 18313263 is 36231381.

It is a happy number.

It is not a de Polignac number, because 18313263 - 2² = 18313259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18313223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1408 + ... + 6213.

It is an arithmetic number, because the mean of its divisors is an integer number (1714950).

Almost surely, 2^18313263 is an apocalyptic number.

18313263 is a deficient number, since it is larger than the sum of its proper divisors (9125937).

18313263 is an equidigital number, since it uses as much as digits as its factorization.

18313263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7719 (or 7713 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 18313263 is about 4279.3998410992. The cubic root of 18313263 is about 263.5857397591.

The spelling of 18313263 in words is "eighteen million, three hundred thirteen thousand, two hundred sixty-three".