1389587985 has 12 divisors (see below), whose sum is σ = 2408619252. Its totient is φ = 741113568.

The previous prime is 1389587963. The next prime is 1389587999. The reversal of 1389587985 is 5897859831.

It can be written as a sum of positive squares in 2 ways, for example, as 636250176 + 753337809 = 25224^2 + 27447^2 .

It is not a de Polignac number, because 1389587985 - 2¹¹ = 1389585937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15439822 + ... + 15439911.

It is an arithmetic number, because the mean of its divisors is an integer number (200718271).

Almost surely, 2^1389587985 is an apocalyptic number.

1389587985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389587985 is a deficient number, since it is larger than the sum of its proper divisors (1019031267).

1389587985 is a wasteful number, since it uses less digits than its factorization.

1389587985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30879744 (or 30879741 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 63.

The square root of 1389587985 is about 37277.1778035838. The cubic root of 1389587985 is about 1115.9087512590.

The spelling of 1389587985 in words is "one billion, three hundred eighty-nine million, five hundred eighty-seven thousand, nine hundred eighty-five".