815841 has 24 divisors (see below), whose sum is σ = 1339520. Its totient is φ = 474336.

The previous prime is 815831. The next prime is 815851. The reversal of 815841 is 148518.

815841 is a `hidden beast` number, since 81 + 584 + 1 = 666.

815841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (815831) and next prime (815851).

It is not a de Polignac number, because 815841 - 2⁵ = 815809 is a prime.

It is a Curzon number.

815841 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815821) 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, 2040 + ... + 2406.

2⁸¹⁵⁸⁴¹ is an apocalyptic number.

It is an amenable number.

815841 is a deficient number, since it is larger than the sum of its proper divisors (523679).

815841 is a wasteful number, since it uses less digits than its factorization.

815841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 402 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 815841 is about 903.2391709841. The cubic root of 815841 is about 93.4405047262.

The spelling of 815841 in words is "eight hundred fifteen thousand, eight hundred forty-one".