18668347 has 4 divisors (see below), whose sum is σ = 18696760. Its totient is φ = 18639936.

The previous prime is 18668339. The next prime is 18668357. The reversal of 18668347 is 74386681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74386681 = 97 ⋅766873.

It is a cyclic number.

It is not a de Polignac number, because 18668347 - 2³ = 18668339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668327) 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, 13197 + ... + 14542.

It is an arithmetic number, because the mean of its divisors is an integer number (4674190).

Almost surely, 2^18668347 is an apocalyptic number.

18668347 is a deficient number, since it is larger than the sum of its proper divisors (28413).

18668347 is an equidigital number, since it uses as much as digits as its factorization.

18668347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28412.

The product of its digits is 193536, while the sum is 43.

The square root of 18668347 is about 4320.6882553593. The cubic root of 18668347 is about 265.2784399810.

The spelling of 18668347 in words is "eighteen million, six hundred sixty-eight thousand, three hundred forty-seven".