816242985 has 24 divisors (see below), whose sum is σ = 1447727424. Its totient is φ = 425204640.

The previous prime is 816242969. The next prime is 816243007. The reversal of 816242985 is 589242618.

It is not a de Polignac number, because 816242985 - 2⁴ = 816242969 is a prime.

It is a super-2 number, since 2×816242985² = 1332505221123420450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 816242985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208981 + ... + 212850.

It is an arithmetic number, because the mean of its divisors is an integer number (60321976).

Almost surely, 2^816242985 is an apocalyptic number.

It is an amenable number.

816242985 is a deficient number, since it is larger than the sum of its proper divisors (631484439).

816242985 is a wasteful number, since it uses less digits than its factorization.

816242985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421885 (or 421882 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 816242985 is about 28569.9664858046. The cubic root of 816242985 is about 934.5584902075.

The spelling of 816242985 in words is "eight hundred sixteen million, two hundred forty-two thousand, nine hundred eighty-five".