82866397 has 4 divisors (see below), whose sum is σ = 83101500. Its totient is φ = 82631296.

The previous prime is 82866367. The next prime is 82866409. The reversal of 82866397 is 79366828.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26481316 + 56385081 = 5146^2 + 7509^2 .

It is a cyclic number.

It is not a de Polignac number, because 82866397 - 2²³ = 74477789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82866397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82866307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117022 + ... + 117727.

It is an arithmetic number, because the mean of its divisors is an integer number (20775375).

Almost surely, 2^82866397 is an apocalyptic number.

It is an amenable number.

82866397 is a deficient number, since it is larger than the sum of its proper divisors (235103).

82866397 is a wasteful number, since it uses less digits than its factorization.

82866397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235102.

The product of its digits is 870912, while the sum is 49.

The square root of 82866397 is about 9103.0982088518. The cubic root of 82866397 is about 435.9728909582.

The spelling of 82866397 in words is "eighty-two million, eight hundred sixty-six thousand, three hundred ninety-seven".