82389691 has 4 divisors (see below), whose sum is σ = 82693984. Its totient is φ = 82085400.

The previous prime is 82389689. The next prime is 82389733. The reversal of 82389691 is 19698328.

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

It is a cyclic number.

It is not a de Polignac number, because 82389691 - 2¹ = 82389689 is a prime.

It is a super-2 number, since 2×82389691² = 13576122366150962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82389631) 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, 151740 + ... + 152281.

It is an arithmetic number, because the mean of its divisors is an integer number (20673496).

Almost surely, 2^82389691 is an apocalyptic number.

82389691 is a deficient number, since it is larger than the sum of its proper divisors (304293).

82389691 is a wasteful number, since it uses less digits than its factorization.

82389691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304292.

The product of its digits is 186624, while the sum is 46.

The square root of 82389691 is about 9076.8767205466. The cubic root of 82389691 is about 435.1352747910.

The spelling of 82389691 in words is "eighty-two million, three hundred eighty-nine thousand, six hundred ninety-one".