8172213 has 16 divisors (see below), whose sum is σ = 12579456. Its totient is φ = 4622400.

The previous prime is 8172211. The next prime is 8172233. The reversal of 8172213 is 3122718.

8172213 = 92² + 93² + ... + 293².

It is not a de Polignac number, because 8172213 - 2¹ = 8172211 is a prime.

8172213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8172211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 4047.

It is an arithmetic number, because the mean of its divisors is an integer number (786216).

Almost surely, 2^8172213 is an apocalyptic number.

It is an amenable number.

8172213 is a deficient number, since it is larger than the sum of its proper divisors (4407243).

8172213 is a wasteful number, since it uses less digits than its factorization.

8172213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964.

The product of its digits is 672, while the sum is 24.

The square root of 8172213 is about 2858.7082747283. The cubic root of 8172213 is about 201.4249320661.

It can be divided in two parts, 8172 and 213, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 8172213 in words is "eight million, one hundred seventy-two thousand, two hundred thirteen".