1438327813 has 4 divisors (see below), whose sum is σ = 1548968428. Its totient is φ = 1327687200.

The previous prime is 1438327771. The next prime is 1438327867. The reversal of 1438327813 is 3187238341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3187238341 = 7 ⋅455319763.

It can be written as a sum of positive squares in 2 ways, for example, as 431725284 + 1006602529 = 20778^2 + 31727^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438327813 - 2¹³ = 1438319621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438327013) 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, 55320288 + ... + 55320313.

It is an arithmetic number, because the mean of its divisors is an integer number (387242107).

Almost surely, 2^1438327813 is an apocalyptic number.

1438327813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1438327813 is a deficient number, since it is larger than the sum of its proper divisors (110640615).

1438327813 is a wasteful number, since it uses less digits than its factorization.

1438327813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110640614.

The product of its digits is 96768, while the sum is 40.

The square root of 1438327813 is about 37925.2925235917. The cubic root of 1438327813 is about 1128.8059575149.

The spelling of 1438327813 in words is "one billion, four hundred thirty-eight million, three hundred twenty-seven thousand, eight hundred thirteen".