18968647 has 8 divisors (see below), whose sum is σ = 19393344. Its totient is φ = 18546528.

The previous prime is 18968627. The next prime is 18968657. The reversal of 18968647 is 74686981.

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 18968647 - 2¹¹ = 18966599 is a prime.

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 18968647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18968627) 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, 24153 + ... + 24925.

It is an arithmetic number, because the mean of its divisors is an integer number (2424168).

Almost surely, 2^18968647 is an apocalyptic number.

18968647 is a deficient number, since it is larger than the sum of its proper divisors (424697).

18968647 is an equidigital number, since it uses as much as digits as its factorization.

18968647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 580608, while the sum is 49.

The square root of 18968647 is about 4355.3010228915. The cubic root of 18968647 is about 266.6933079286.

The spelling of 18968647 in words is "eighteen million, nine hundred sixty-eight thousand, six hundred forty-seven".