13440023444 has 24 divisors (see below), whose sum is σ = 23998265928. Its totient is φ = 6583740800.

The previous prime is 13440023431. The next prime is 13440023459. The reversal of 13440023444 is 44432004431.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3523847044 + 9916176400 = 59362^2 + 99580^2 .

It is a super-2 number, since 2×13440023444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103394 + ... + 193830.

It is an arithmetic number, because the mean of its divisors is an integer number (999927747).

Almost surely, 2^13440023444 is an apocalyptic number.

It is an amenable number.

13440023444 is a deficient number, since it is larger than the sum of its proper divisors (10558242484).

13440023444 is a wasteful number, since it uses less digits than its factorization.

13440023444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91195 (or 91193 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 13440023444 its reverse (44432004431), we get a palindrome (57872027875).

The spelling of 13440023444 in words is "thirteen billion, four hundred forty million, twenty-three thousand, four hundred forty-four".