18685017 has 12 divisors (see below), whose sum is σ = 29065764. Its totient is φ = 11498400.

The previous prime is 18685003. The next prime is 18685049. The reversal of 18685017 is 71058681.

It can be written as a sum of positive squares in 2 ways, for example, as 5875776 + 12809241 = 2424^2 + 3579^2 .

It is not a de Polignac number, because 18685017 - 2⁸ = 18684761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79734 + ... + 79967.

It is an arithmetic number, because the mean of its divisors is an integer number (2422147).

Almost surely, 2^18685017 is an apocalyptic number.

It is an amenable number.

18685017 is a deficient number, since it is larger than the sum of its proper divisors (10380747).

18685017 is a wasteful number, since it uses less digits than its factorization.

18685017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159720 (or 159717 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 18685017 is about 4322.6169157121. The cubic root of 18685017 is about 265.3573770891.

It can be divided in two parts, 18 and 685017, that added together give a triangular number (685035 = T₁₁₇₀).

The spelling of 18685017 in words is "eighteen million, six hundred eighty-five thousand, seventeen".