82138215 has 8 divisors (see below), whose sum is σ = 131421168. Its totient is φ = 43807040.

The previous prime is 82138201. The next prime is 82138219. The reversal of 82138215 is 51283128.

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

It is not a de Polignac number, because 82138215 - 2⁵ = 82138183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82138219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2737926 + ... + 2737955.

It is an arithmetic number, because the mean of its divisors is an integer number (16427646).

Almost surely, 2^82138215 is an apocalyptic number.

82138215 is a deficient number, since it is larger than the sum of its proper divisors (49282953).

82138215 is a wasteful number, since it uses less digits than its factorization.

82138215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475889.

The product of its digits is 3840, while the sum is 30.

The square root of 82138215 is about 9063.0135716548. The cubic root of 82138215 is about 434.6921060764.

The spelling of 82138215 in words is "eighty-two million, one hundred thirty-eight thousand, two hundred fifteen".