13440423 has 4 divisors (see below), whose sum is σ = 17920568. Its totient is φ = 8960280.

The previous prime is 13440419. The next prime is 13440431. The reversal of 13440423 is 32404431.

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

It is not a de Polignac number, because 13440423 - 2² = 13440419 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 13440423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240068 + ... + 2240073.

It is an arithmetic number, because the mean of its divisors is an integer number (4480142).

Almost surely, 2^13440423 is an apocalyptic number.

13440423 is a deficient number, since it is larger than the sum of its proper divisors (4480145).

13440423 is an equidigital number, since it uses as much as digits as its factorization.

13440423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480144.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 13440423 is about 3666.1182468655. The cubic root of 13440423 is about 237.7593724087.

Adding to 13440423 its reverse (32404431), we get a palindrome (45844854).

The spelling of 13440423 in words is "thirteen million, four hundred forty thousand, four hundred twenty-three".