82158397 has 4 divisors (see below), whose sum is σ = 83906496. Its totient is φ = 80410300.

The previous prime is 82158367. The next prime is 82158403. The reversal of 82158397 is 79385128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82158397 - 2⁷ = 82158269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82158317) 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, 873979 + ... + 874072.

It is an arithmetic number, because the mean of its divisors is an integer number (20976624).

Almost surely, 2^82158397 is an apocalyptic number.

It is an amenable number.

82158397 is a deficient number, since it is larger than the sum of its proper divisors (1748099).

82158397 is a wasteful number, since it uses less digits than its factorization.

82158397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748098.

The product of its digits is 120960, while the sum is 43.

The square root of 82158397 is about 9064.1269298262. The cubic root of 82158397 is about 434.7277055744.

The spelling of 82158397 in words is "eighty-two million, one hundred fifty-eight thousand, three hundred ninety-seven".