815530 has 8 divisors (see below), whose sum is σ = 1467972. Its totient is φ = 326208.

The previous prime is 815527. The next prime is 815533. The reversal of 815530 is 35518.

815530 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 (815527) and next prime (815533).

It can be written as a sum of positive squares in 2 ways, for example, as 815409 + 121 = 903^2 + 11^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (815533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40767 + ... + 40786.

2⁸¹⁵⁵³⁰ is an apocalyptic number.

815530 is a deficient number, since it is larger than the sum of its proper divisors (652442).

815530 is a wasteful number, since it uses less digits than its factorization.

815530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81560.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 815530 is about 903.0669964072. The cubic root of 815530 is about 93.4286299899.

It can be divided in two parts, 8155 and 30, that multiplied together give a triangular number (244650 = T₆₉₉).

The spelling of 815530 in words is "eight hundred fifteen thousand, five hundred thirty".