18945617 has 8 divisors (see below), whose sum is σ = 19389480. Its totient is φ = 18506880.

The previous prime is 18945611. The next prime is 18945637. The reversal of 18945617 is 71654981.

It can be written as a sum of positive squares in 4 ways, for example, as 421201 + 18524416 = 649^2 + 4304^2 .

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 18945617 - 2⁴ = 18945601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945611) 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, 6767 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (2423685).

Almost surely, 2^18945617 is an apocalyptic number.

It is an amenable number.

18945617 is a deficient number, since it is larger than the sum of its proper divisors (443863).

18945617 is a wasteful number, since it uses less digits than its factorization.

18945617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its digits is 60480, while the sum is 41.

The square root of 18945617 is about 4352.6563154010. The cubic root of 18945617 is about 266.5853326607.

The spelling of 18945617 in words is "eighteen million, nine hundred forty-five thousand, six hundred seventeen".