818985 has 16 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 430080.

The previous prime is 818977. The next prime is 818999. The reversal of 818985 is 589818.

818985 = T₁₁₅ + T₁₁₆ + ... + T₁₈₅.

It is not a de Polignac number, because 818985 - 2³ = 818977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2⁸¹⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

818985 is a deficient number, since it is larger than the sum of its proper divisors (511575).

818985 is a wasteful number, since it uses less digits than its factorization.

818985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848.

The product of its digits is 23040, while the sum is 39.

The square root of 818985 is about 904.9779002827. The cubic root of 818985 is about 93.5603811798.

The spelling of 818985 in words is "eight hundred eighteen thousand, nine hundred eighty-five".