1397839591 has 2 divisors, whose sum is σ = 1397839592. Its totient is φ = 1397839590.

The previous prime is 1397839537. The next prime is 1397839601. The reversal of 1397839591 is 1959387931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1397839591 - 2¹⁹ = 1397315303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397839511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698919795 + 698919796.

It is an arithmetic number, because the mean of its divisors is an integer number (698919796).

Almost surely, 2^1397839591 is an apocalyptic number.

1397839591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397839591 is an equidigital number, since it uses as much as digits as its factorization.

1397839591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 55.

The square root of 1397839591 is about 37387.6930419624. The cubic root of 1397839591 is about 1118.1132111529.

The spelling of 1397839591 in words is "one billion, three hundred ninety-seven million, eight hundred thirty-nine thousand, five hundred ninety-one".