8212945 has 16 divisors (see below), whose sum is σ = 10982160. Its totient is φ = 5854464.

The previous prime is 8212931. The next prime is 8212951. The reversal of 8212945 is 5492128.

It can be written as a sum of positive squares in 8 ways, for example, as 124609 + 8088336 = 353^2 + 2844^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212945 - 2⁵ = 8212913 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294 + ... + 4063.

It is an arithmetic number, because the mean of its divisors is an integer number (686385).

Almost surely, 2^8212945 is an apocalyptic number.

It is an amenable number.

8212945 is a deficient number, since it is larger than the sum of its proper divisors (2769215).

8212945 is a wasteful number, since it uses less digits than its factorization.

8212945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404.

The product of its digits is 5760, while the sum is 31.

The square root of 8212945 is about 2865.8236163449. The cubic root of 8212945 is about 201.7590254578.

The spelling of 8212945 in words is "eight million, two hundred twelve thousand, nine hundred forty-five".