18263313 has 20 divisors (see below), whose sum is σ = 28720560. Its totient is φ = 11533752.

The previous prime is 18263303. The next prime is 18263317. The reversal of 18263313 is 31336281.

It is a happy number.

18263313 is a `hidden beast` number, since 18 + 2 + 633 + 13 = 666.

It is not a de Polignac number, because 18263313 - 2⁵ = 18263281 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18263317) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 4395 + ... + 7472.

It is an arithmetic number, because the mean of its divisors is an integer number (1436028).

Almost surely, 2^18263313 is an apocalyptic number.

It is an amenable number.

18263313 is a deficient number, since it is larger than the sum of its proper divisors (10457247).

18263313 is a wasteful number, since it uses less digits than its factorization.

18263313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11898 (or 11889 counting only the distinct ones).

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

The square root of 18263313 is about 4273.5597573920. The cubic root of 18263313 is about 263.3458754197.

Adding to 18263313 its reverse (31336281), we get a palindrome (49599594).

The spelling of 18263313 in words is "eighteen million, two hundred sixty-three thousand, three hundred thirteen".