18656849 has 4 divisors (see below), whose sum is σ = 18740736. Its totient is φ = 18572964.

The previous prime is 18656819. The next prime is 18656851. The reversal of 18656849 is 94865681.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18656849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18656819) 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, 41609 + ... + 42054.

It is an arithmetic number, because the mean of its divisors is an integer number (4685184).

Almost surely, 2^18656849 is an apocalyptic number.

It is an amenable number.

18656849 is a deficient number, since it is larger than the sum of its proper divisors (83887).

18656849 is an equidigital number, since it uses as much as digits as its factorization.

18656849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83886.

The product of its digits is 414720, while the sum is 47.

The square root of 18656849 is about 4319.3574753660. The cubic root of 18656849 is about 265.2239663502.

The spelling of 18656849 in words is "eighteen million, six hundred fifty-six thousand, eight hundred forty-nine".