18936317 has 8 divisors (see below), whose sum is σ = 20429496. Its totient is φ = 17485312.

The previous prime is 18936311. The next prime is 18936343. The reversal of 18936317 is 71363981.

It can be written as a sum of positive squares in 4 ways, for example, as 1413721 + 17522596 = 1189^2 + 4186^2 .

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 18936317 - 2²⁰ = 17887741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18936311) 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, 9608 + ... + 11409.

It is an arithmetic number, because the mean of its divisors is an integer number (2553687).

Almost surely, 2^18936317 is an apocalyptic number.

18936317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18936317 is a deficient number, since it is larger than the sum of its proper divisors (1493179).

18936317 is a wasteful number, since it uses less digits than its factorization.

18936317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21087.

The product of its digits is 27216, while the sum is 38.

The square root of 18936317 is about 4351.5878711110. The cubic root of 18936317 is about 266.5417051668.

The spelling of 18936317 in words is "eighteen million, nine hundred thirty-six thousand, three hundred seventeen".