1338791 has 2 divisors, whose sum is σ = 1338792. Its totient is φ = 1338790.

The previous prime is 1338787. The next prime is 1338793. The reversal of 1338791 is 1978331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1338791 - 2² = 1338787 is a prime.

It is a super-2 number, since 2×1338791² = 3584722683362, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1338793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669395 + 669396.

It is an arithmetic number, because the mean of its divisors is an integer number (669396).

2^1338791 is an apocalyptic number.

1338791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338791 is an equidigital number, since it uses as much as digits as its factorization.

1338791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 1338791 is about 1157.0613639734. The cubic root of 1338791 is about 110.2142106810.

The spelling of 1338791 in words is "one million, three hundred thirty-eight thousand, seven hundred ninety-one".