18223967 has 4 divisors (see below), whose sum is σ = 18668496. Its totient is φ = 17779440.

The previous prime is 18223951. The next prime is 18223969. The reversal of 18223967 is 76932281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18223967 - 2⁴ = 18223951 is a prime.

It is a super-2 number, since 2×18223967² = 664225946434178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18223967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223969) 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 3 ways as a sum of consecutive naturals, for example, 222203 + ... + 222284.

It is an arithmetic number, because the mean of its divisors is an integer number (4667124).

Almost surely, 2^18223967 is an apocalyptic number.

18223967 is a deficient number, since it is larger than the sum of its proper divisors (444529).

18223967 is an equidigital number, since it uses as much as digits as its factorization.

18223967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444528.

The product of its digits is 36288, while the sum is 38.

The square root of 18223967 is about 4268.9538531120. The cubic root of 18223967 is about 263.1566243118.

The spelling of 18223967 in words is "eighteen million, two hundred twenty-three thousand, nine hundred sixty-seven".