812145 has 16 divisors (see below), whose sum is σ = 1344960. Its totient is φ = 417984.

The previous prime is 812137. The next prime is 812167. The reversal of 812145 is 541218.

It is not a de Polignac number, because 812145 - 2³ = 812137 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 812145.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (84060).

2⁸¹²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

812145 is a deficient number, since it is larger than the sum of its proper divisors (532815).

812145 is a wasteful number, since it uses less digits than its factorization.

812145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904.

The product of its digits is 320, while the sum is 21.

The square root of 812145 is about 901.1908787821. The cubic root of 812145 is about 93.2991867718.

The spelling of 812145 in words is "eight hundred twelve thousand, one hundred forty-five".