82212405 has 16 divisors (see below), whose sum is σ = 143498304. Its totient is φ = 39860480.

The previous prime is 82212371. The next prime is 82212407. The reversal of 82212405 is 50421228.

It is not a de Polignac number, because 82212405 - 2⁹ = 82211893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82212407) 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, 248964 + ... + 249293.

It is an arithmetic number, because the mean of its divisors is an integer number (8968644).

Almost surely, 2^82212405 is an apocalyptic number.

It is an amenable number.

82212405 is a deficient number, since it is larger than the sum of its proper divisors (61285899).

82212405 is a wasteful number, since it uses less digits than its factorization.

82212405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498276.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 82212405 is about 9067.1056572646. The cubic root of 82212405 is about 434.8229428719.

The spelling of 82212405 in words is "eighty-two million, two hundred twelve thousand, four hundred five".