18946849 has 8 divisors (see below), whose sum is σ = 19522728. Its totient is φ = 18374400.

The previous prime is 18946843. The next prime is 18946853. The reversal of 18946849 is 94864981.

It can be written as a sum of positive squares in 4 ways, for example, as 14137600 + 4809249 = 3760^2 + 2193^2 .

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 18946849 - 2⁵ = 18946817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18946843) 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, 14199 + ... + 15475.

It is an arithmetic number, because the mean of its divisors is an integer number (2440341).

Almost surely, 2^18946849 is an apocalyptic number.

It is an amenable number.

18946849 is a deficient number, since it is larger than the sum of its proper divisors (575879).

18946849 is a wasteful number, since it uses less digits than its factorization.

18946849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its digits is 497664, while the sum is 49.

The square root of 18946849 is about 4352.7978358752. The cubic root of 18946849 is about 266.5911110599.

The spelling of 18946849 in words is "eighteen million, nine hundred forty-six thousand, eight hundred forty-nine".