1338216637 has 4 divisors (see below), whose sum is σ = 1338337980. Its totient is φ = 1338095296.

The previous prime is 1338216623. The next prime is 1338216647. The reversal of 1338216637 is 7366128331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 727434841 + 610781796 = 26971^2 + 24714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338216637 - 2²⁷ = 1203998909 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1338216637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338216617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42268 + ... + 66805.

It is an arithmetic number, because the mean of its divisors is an integer number (334584495).

Almost surely, 2^1338216637 is an apocalyptic number.

It is an amenable number.

1338216637 is a deficient number, since it is larger than the sum of its proper divisors (121343).

1338216637 is a wasteful number, since it uses less digits than its factorization.

1338216637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121342.

The product of its digits is 108864, while the sum is 40.

The square root of 1338216637 is about 36581.6434431260. The cubic root of 1338216637 is about 1101.9844719997.

The spelling of 1338216637 in words is "one billion, three hundred thirty-eight million, two hundred sixteen thousand, six hundred thirty-seven".