815706 has 12 divisors (see below), whose sum is σ = 1767402. Its totient is φ = 271896.

The previous prime is 815693. The next prime is 815713. The reversal of 815706 is 607518.

815706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 84681 = 855^2 + 291^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 815706.

It is an unprimeable number.

815706 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22641 + ... + 22676.

2⁸¹⁵⁷⁰⁶ is an apocalyptic number.

815706 is an abundant number, since it is smaller than the sum of its proper divisors (951696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

815706 is a wasteful number, since it uses less digits than its factorization.

815706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45325 (or 45322 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 815706 is about 903.1644368552. The cubic root of 815706 is about 93.4353504686.

It can be divided in two parts, 815 and 706, that added together give a square (1521 = 39²).

The spelling of 815706 in words is "eight hundred fifteen thousand, seven hundred six".