18022913 has 4 divisors (see below), whose sum is σ = 18044208. Its totient is φ = 18001620.

The previous prime is 18022909. The next prime is 18022937. The reversal of 18022913 is 31922081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18022913 - 2² = 18022909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18022943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9323 + ... + 11088.

It is an arithmetic number, because the mean of its divisors is an integer number (4511052).

Almost surely, 2^18022913 is an apocalyptic number.

It is an amenable number.

18022913 is a deficient number, since it is larger than the sum of its proper divisors (21295).

18022913 is an equidigital number, since it uses as much as digits as its factorization.

18022913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21294.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18022913 is about 4245.3401512717. The cubic root of 18022913 is about 262.1852942095.

Adding to 18022913 its reverse (31922081), we get a palindrome (49944994).

The spelling of 18022913 in words is "eighteen million, twenty-two thousand, nine hundred thirteen".