18285917 has 4 divisors (see below), whose sum is σ = 19692540. Its totient is φ = 16879296.

The previous prime is 18285889. The next prime is 18285919. The reversal of 18285917 is 71958281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71958281 = 157 ⋅458333.

It can be written as a sum of positive squares in 2 ways, for example, as 8916196 + 9369721 = 2986^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 18285917 - 2⁸ = 18285661 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 (18285919) 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, 703292 + ... + 703317.

It is an arithmetic number, because the mean of its divisors is an integer number (4923135).

Almost surely, 2^18285917 is an apocalyptic number.

It is an amenable number.

18285917 is a deficient number, since it is larger than the sum of its proper divisors (1406623).

18285917 is a wasteful number, since it uses less digits than its factorization.

18285917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406622.

The product of its digits is 40320, while the sum is 41.

The square root of 18285917 is about 4276.2035732645. The cubic root of 18285917 is about 263.4544759428.

The spelling of 18285917 in words is "eighteen million, two hundred eighty-five thousand, nine hundred seventeen".