1338391 has 2 divisors, whose sum is σ = 1338392. Its totient is φ = 1338390.

The previous prime is 1338377. The next prime is 1338397. The reversal of 1338391 is 1938331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1338391 - 2¹¹ = 1336343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669195 + 669196.

It is an arithmetic number, because the mean of its divisors is an integer number (669196).

2^1338391 is an apocalyptic number.

1338391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338391 is an equidigital number, since it uses as much as digits as its factorization.

1338391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 1338391 is about 1156.8884993810. Note that the first 3 decimals coincide. The cubic root of 1338391 is about 110.2032330961.

The spelling of 1338391 in words is "one million, three hundred thirty-eight thousand, three hundred ninety-one".