82442639 has 4 divisors (see below), whose sum is σ = 87292224. Its totient is φ = 77593056.

The previous prime is 82442611. The next prime is 82442651. The reversal of 82442639 is 93624428.

It is a happy number.

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 82442639 - 2⁸ = 82442383 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 (82442699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2424767 + ... + 2424800.

It is an arithmetic number, because the mean of its divisors is an integer number (21823056).

Almost surely, 2^82442639 is an apocalyptic number.

82442639 is a deficient number, since it is larger than the sum of its proper divisors (4849585).

82442639 is a wasteful number, since it uses less digits than its factorization.

82442639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849584.

The product of its digits is 82944, while the sum is 38.

The square root of 82442639 is about 9079.7928941138. The cubic root of 82442639 is about 435.2284685249.

The spelling of 82442639 in words is "eighty-two million, four hundred forty-two thousand, six hundred thirty-nine".