985815 has 24 divisors (see below), whose sum is σ = 1800240. Its totient is φ = 497664.

The previous prime is 985807. The next prime is 985819. The reversal of 985815 is 518589.

It is not a de Polignac number, because 985815 - 2³ = 985807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 985815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (75010).

2⁹⁸⁵⁸¹⁵ is an apocalyptic number.

985815 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

985815 is a deficient number, since it is larger than the sum of its proper divisors (814425).

985815 is a wasteful number, since it uses less digits than its factorization.

985815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183 (or 1180 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 985815 is about 992.8821682355. The cubic root of 985815 is about 99.5249131660.

The spelling of 985815 in words is "nine hundred eighty-five thousand, eight hundred fifteen".