13440023 has 4 divisors (see below), whose sum is σ = 13667880. Its totient is φ = 13212168.

The previous prime is 13440001. The next prime is 13440041. The reversal of 13440023 is 32004431.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13440023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13439983 and 13440010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113840 + ... + 113957.

It is an arithmetic number, because the mean of its divisors is an integer number (3416970).

Almost surely, 2^13440023 is an apocalyptic number.

13440023 is a deficient number, since it is larger than the sum of its proper divisors (227857).

13440023 is an equidigital number, since it uses as much as digits as its factorization.

13440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227856.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 13440023 is about 3666.0636928455. The cubic root of 13440023 is about 237.7570137357.

Adding to 13440023 its reverse (32004431), we get a palindrome (45444454).

The spelling of 13440023 in words is "thirteen million, four hundred forty thousand, twenty-three".