915861 has 12 divisors (see below), whose sum is σ = 1260672. Its totient is φ = 591408.

The previous prime is 915851. The next prime is 915869. The reversal of 915861 is 168519.

It is a happy number.

It is not a de Polignac number, because 915861 - 2¹⁴ = 899477 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

915861 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 915861.

It is not an unprimeable number, because it can be changed into a prime (915869) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3996 + ... + 4218.

It is an arithmetic number, because the mean of its divisors is an integer number (105056).

2⁹¹⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

915861 is a deficient number, since it is larger than the sum of its proper divisors (344811).

915861 is a wasteful number, since it uses less digits than its factorization.

915861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 263 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 915861 is about 957.0062695719. The cubic root of 915861 is about 97.1128102616.

The spelling of 915861 in words is "nine hundred fifteen thousand, eight hundred sixty-one".