40440864823 has 4 divisors (see below), whose sum is σ = 40512696408. Its totient is φ = 40369033240.

The previous prime is 40440864809. The next prime is 40440864859. The reversal of 40440864823 is 32846804404.

40440864823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40440864823 - 2²¹ = 40438767671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40440864823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440864803) 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, 35914948 + ... + 35916073.

It is an arithmetic number, because the mean of its divisors is an integer number (10128174102).

Almost surely, 2^40440864823 is an apocalyptic number.

40440864823 is a deficient number, since it is larger than the sum of its proper divisors (71831585).

40440864823 is an equidigital number, since it uses as much as digits as its factorization.

40440864823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71831584.

The product of its (nonzero) digits is 589824, while the sum is 43.

The spelling of 40440864823 in words is "forty billion, four hundred forty million, eight hundred sixty-four thousand, eight hundred twenty-three".