40440423 has 4 divisors (see below), whose sum is σ = 53920568. Its totient is φ = 26960280.

The previous prime is 40440419. The next prime is 40440451. The reversal of 40440423 is 32404404.

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

It is not a de Polignac number, because 40440423 - 2² = 40440419 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 40440423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440403) 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, 6740068 + ... + 6740073.

It is an arithmetic number, because the mean of its divisors is an integer number (13480142).

Almost surely, 2^40440423 is an apocalyptic number.

40440423 is a deficient number, since it is larger than the sum of its proper divisors (13480145).

40440423 is a wasteful number, since it uses less digits than its factorization.

40440423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13480144.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 40440423 is about 6359.2784968108. The cubic root of 40440423 is about 343.2457984235.

Adding to 40440423 its reverse (32404404), we get a palindrome (72844827).

The spelling of 40440423 in words is "forty million, four hundred forty thousand, four hundred twenty-three".