812945 has 8 divisors (see below), whose sum is σ = 1114944. Its totient is φ = 557424.

The previous prime is 812939. The next prime is 812963. The reversal of 812945 is 549218.

812945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 812945 - 2⁸ = 812689 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11579 + ... + 11648.

It is an arithmetic number, because the mean of its divisors is an integer number (139368).

2⁸¹²⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

812945 is a deficient number, since it is larger than the sum of its proper divisors (301999).

812945 is a wasteful number, since it uses less digits than its factorization.

812945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23239.

The product of its digits is 2880, while the sum is 29.

The square root of 812945 is about 901.6346266643. The cubic root of 812945 is about 93.3298113750.

The spelling of 812945 in words is "eight hundred twelve thousand, nine hundred forty-five".