1397839 has 2 divisors, whose sum is σ = 1397840. Its totient is φ = 1397838.

The previous prime is 1397833. The next prime is 1397857. The reversal of 1397839 is 9387931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1397839 - 2¹¹ = 1395791 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698919 + 698920.

It is an arithmetic number, because the mean of its divisors is an integer number (698920).

2^1397839 is an apocalyptic number.

1397839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397839 is an equidigital number, since it uses as much as digits as its factorization.

1397839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 1397839 is about 1182.3024147823. The cubic root of 1397839 is about 111.8113053575.

The spelling of 1397839 in words is "one million, three hundred ninety-seven thousand, eight hundred thirty-nine".