1444263813 has 6 divisors (see below), whose sum is σ = 2086158854. Its totient is φ = 962842536.

The previous prime is 1444263803. The next prime is 1444263823. The reversal of 1444263813 is 3183624441.

1444263813 is a `hidden beast` number, since 1 + 4 + 4 + 4 + 2 + 638 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (1444263803) and next prime (1444263823).

It can be written as a sum of positive squares in only one way, i.e., 723502404 + 720761409 = 26898^2 + 26847^2 .

It is not a de Polignac number, because 1444263813 - 2²⁰ = 1443215237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444263803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80236870 + ... + 80236887.

Almost surely, 2^1444263813 is an apocalyptic number.

It is an amenable number.

1444263813 is a deficient number, since it is larger than the sum of its proper divisors (641895041).

1444263813 is a wasteful number, since it uses less digits than its factorization.

1444263813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160473763 (or 160473760 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 1444263813 is about 38003.4710651540. The cubic root of 1444263813 is about 1130.3566924183.

The spelling of 1444263813 in words is "one billion, four hundred forty-four million, two hundred sixty-three thousand, eight hundred thirteen".