18223013 has 4 divisors (see below), whose sum is σ = 18646848. Its totient is φ = 17799180.

The previous prime is 18223003. The next prime is 18223019. The reversal of 18223013 is 31032281.

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 18223013 - 2⁶ = 18222949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223019) 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, 211853 + ... + 211938.

It is an arithmetic number, because the mean of its divisors is an integer number (4661712).

Almost surely, 2^18223013 is an apocalyptic number.

It is an amenable number.

18223013 is a deficient number, since it is larger than the sum of its proper divisors (423835).

18223013 is an equidigital number, since it uses as much as digits as its factorization.

18223013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423834.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18223013 is about 4268.8421146723. The cubic root of 18223013 is about 263.1520322673.

Adding to 18223013 its reverse (31032281), we get a palindrome (49255294).

The spelling of 18223013 in words is "eighteen million, two hundred twenty-three thousand, thirteen".