18068649 has 4 divisors (see below), whose sum is σ = 24091536. Its totient is φ = 12045764.

The previous prime is 18068647. The next prime is 18068651. The reversal of 18068649 is 94686081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18068647) and next prime (18068651).

It is a cyclic number.

It is not a de Polignac number, because 18068649 - 2¹ = 18068647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18068649.

It is not an unprimeable number, because it can be changed into a prime (18068647) 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, 3011439 + ... + 3011444.

It is an arithmetic number, because the mean of its divisors is an integer number (6022884).

Almost surely, 2^18068649 is an apocalyptic number.

It is an amenable number.

18068649 is a deficient number, since it is larger than the sum of its proper divisors (6022887).

18068649 is an equidigital number, since it uses as much as digits as its factorization.

18068649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022886.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 18068649 is about 4250.7233502076. The cubic root of 18068649 is about 262.4068857952.

The spelling of 18068649 in words is "eighteen million, sixty-eight thousand, six hundred forty-nine".