82440231 has 4 divisors (see below), whose sum is σ = 109920312. Its totient is φ = 54960152.

The previous prime is 82440227. The next prime is 82440247. The reversal of 82440231 is 13204428.

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 82440231 - 2² = 82440227 is a prime.

It is a super-2 number, since 2×82440231² = 13592783374666722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82440731) 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, 13740036 + ... + 13740041.

It is an arithmetic number, because the mean of its divisors is an integer number (27480078).

Almost surely, 2^82440231 is an apocalyptic number.

82440231 is a deficient number, since it is larger than the sum of its proper divisors (27480081).

82440231 is a wasteful number, since it uses less digits than its factorization.

82440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27480080.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 82440231 is about 9079.6602910021. The cubic root of 82440231 is about 435.2242310721.

Adding to 82440231 its reverse (13204428), we get a palindrome (95644659).

The spelling of 82440231 in words is "eighty-two million, four hundred forty thousand, two hundred thirty-one".