18668623 has 8 divisors (see below), whose sum is σ = 19044416. Its totient is φ = 18295200.

The previous prime is 18668599. The next prime is 18668641. The reversal of 18668623 is 32686681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18668623 - 2⁵ = 18668591 is a prime.

It is a super-4 number, since 4×18668623⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27913 + ... + 28573.

It is an arithmetic number, because the mean of its divisors is an integer number (2380552).

Almost surely, 2^18668623 is an apocalyptic number.

18668623 is a deficient number, since it is larger than the sum of its proper divisors (375793).

18668623 is an equidigital number, since it uses as much as digits as its factorization.

18668623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185.

The product of its digits is 82944, while the sum is 40.

The square root of 18668623 is about 4320.7201945972. The cubic root of 18668623 is about 265.2797473006.

It can be divided in two parts, 18668 and 623, that added together give a palindrome (19291).

The spelling of 18668623 in words is "eighteen million, six hundred sixty-eight thousand, six hundred twenty-three".