1338893945 has 4 divisors (see below), whose sum is σ = 1606672740. Its totient is φ = 1071115152.

The previous prime is 1338893929. The next prime is 1338893971. The reversal of 1338893945 is 5493988331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5493988331 = 13 ⋅422614487.

It can be written as a sum of positive squares in 2 ways, for example, as 730729024 + 608164921 = 27032^2 + 24661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338893945 - 2⁴ = 1338893929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133889390 + ... + 133889399.

It is an arithmetic number, because the mean of its divisors is an integer number (401668185).

Almost surely, 2^1338893945 is an apocalyptic number.

It is an amenable number.

1338893945 is a deficient number, since it is larger than the sum of its proper divisors (267778795).

1338893945 is an equidigital number, since it uses as much as digits as its factorization.

1338893945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267778794.

The product of its digits is 2799360, while the sum is 53.

The square root of 1338893945 is about 36590.8997566335. The cubic root of 1338893945 is about 1102.1703554588.

The spelling of 1338893945 in words is "one billion, three hundred thirty-eight million, eight hundred ninety-three thousand, nine hundred forty-five".