18223347 has 4 divisors (see below), whose sum is σ = 24297800. Its totient is φ = 12148896.

The previous prime is 18223321. The next prime is 18223349. The reversal of 18223347 is 74332281.

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

It is not a de Polignac number, because 18223347 - 2¹² = 18219251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18223349) 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 3 ways as a sum of consecutive naturals, for example, 3037222 + ... + 3037227.

It is an arithmetic number, because the mean of its divisors is an integer number (6074450).

Almost surely, 2^18223347 is an apocalyptic number.

18223347 is a deficient number, since it is larger than the sum of its proper divisors (6074453).

18223347 is an equidigital number, since it uses as much as digits as its factorization.

18223347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074452.

The product of its digits is 8064, while the sum is 30.

The square root of 18223347 is about 4268.8812351716. The cubic root of 18223347 is about 263.1536399824.

The spelling of 18223347 in words is "eighteen million, two hundred twenty-three thousand, three hundred forty-seven".