18363813 has 8 divisors (see below), whose sum is σ = 26368608. Its totient is φ = 11300784.

The previous prime is 18363799. The next prime is 18363817. The reversal of 18363813 is 31836381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18363813 - 2⁴ = 18363797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363817) 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 7 ways as a sum of consecutive naturals, for example, 235395 + ... + 235472.

It is an arithmetic number, because the mean of its divisors is an integer number (3296076).

Almost surely, 2^18363813 is an apocalyptic number.

18363813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18363813 is a deficient number, since it is larger than the sum of its proper divisors (8004795).

18363813 is a wasteful number, since it uses less digits than its factorization.

18363813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470883.

The product of its digits is 10368, while the sum is 33.

The square root of 18363813 is about 4285.3019730236. The cubic root of 18363813 is about 263.8280417141.

The spelling of 18363813 in words is "eighteen million, three hundred sixty-three thousand, eight hundred thirteen".