1389585797 has 4 divisors (see below), whose sum is σ = 1471326156. Its totient is φ = 1307845440.

The previous prime is 1389585787. The next prime is 1389585809. The reversal of 1389585797 is 7975859831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 713637796 + 675948001 = 26714^2 + 25999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389585797 - 2¹⁸ = 1389323653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389585707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40870154 + ... + 40870187.

It is an arithmetic number, because the mean of its divisors is an integer number (367831539).

Almost surely, 2^1389585797 is an apocalyptic number.

1389585797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1389585797 is a deficient number, since it is larger than the sum of its proper divisors (81740359).

1389585797 is an equidigital number, since it uses as much as digits as its factorization.

1389585797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81740358.

The product of its digits is 19051200, while the sum is 62.

The square root of 1389585797 is about 37277.1484558570. The cubic root of 1389585797 is about 1115.9081655675.

The spelling of 1389585797 in words is "one billion, three hundred eighty-nine million, five hundred eighty-five thousand, seven hundred ninety-seven".