1338764813 has 4 divisors (see below), whose sum is σ = 1339951740. Its totient is φ = 1337577888.

The previous prime is 1338764783. The next prime is 1338764831. The reversal of 1338764813 is 3184678331.

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 463670089 + 875094724 = 21533^2 + 29582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338764813 - 2¹⁴ = 1338748429 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 (1338764863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591770 + ... + 594027.

It is an arithmetic number, because the mean of its divisors is an integer number (334987935).

Almost surely, 2^1338764813 is an apocalyptic number.

It is an amenable number.

1338764813 is a deficient number, since it is larger than the sum of its proper divisors (1186927).

1338764813 is a wasteful number, since it uses less digits than its factorization.

1338764813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186926.

The product of its digits is 290304, while the sum is 44.

The square root of 1338764813 is about 36589.1351769894. The cubic root of 1338764813 is about 1102.1349207283.

The spelling of 1338764813 in words is "one billion, three hundred thirty-eight million, seven hundred sixty-four thousand, eight hundred thirteen".