812609 has 8 divisors (see below), whose sum is σ = 960960. Its totient is φ = 672336.

The previous prime is 812599. The next prime is 812627. The reversal of 812609 is 906218.

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

It is not a de Polignac number, because 812609 - 2⁸ = 812353 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (812639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799 + ... + 2204.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2⁸¹²⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

812609 is a deficient number, since it is larger than the sum of its proper divisors (148351).

812609 is a wasteful number, since it uses less digits than its factorization.

812609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 812609 is about 901.4482791597. The cubic root of 812609 is about 93.3169514899.

The spelling of 812609 in words is "eight hundred twelve thousand, six hundred nine".