1286387989 has 8 divisors (see below), whose sum is σ = 1354445280. Its totient is φ = 1218366000.

The previous prime is 1286387987. The next prime is 1286388001. The reversal of 1286387989 is 9897836821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1286387989 - 2¹ = 1286387987 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 (1286387981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101379 + ... + 113359.

It is an arithmetic number, because the mean of its divisors is an integer number (169305660).

Almost surely, 2^1286387989 is an apocalyptic number.

1286387989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1286387989 is a deficient number, since it is larger than the sum of its proper divisors (68057291).

1286387989 is a wasteful number, since it uses less digits than its factorization.

1286387989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17651.

The product of its digits is 10450944, while the sum is 61.

The square root of 1286387989 is about 35866.2513931969. The cubic root of 1286387989 is about 1087.5702658434.

The spelling of 1286387989 in words is "one billion, two hundred eighty-six million, three hundred eighty-seven thousand, nine hundred eighty-nine".