1288985857 has 16 divisors (see below), whose sum is σ = 1331447040. Its totient is φ = 1247246208.

The previous prime is 1288985851. The next prime is 1288985891. The reversal of 1288985857 is 7585898821.

It is a cyclic number.

It is not a de Polignac number, because 1288985857 - 2⁷ = 1288985729 is a prime.

It is a super-2 number, since 2×1288985857² = 3322969079092048898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1288985795 and 1288985804.

It is not an unprimeable number, because it can be changed into a prime (1288985851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265069 + ... + 2265637.

It is an arithmetic number, because the mean of its divisors is an integer number (83215440).

Almost surely, 2^1288985857 is an apocalyptic number.

It is an amenable number.

1288985857 is a deficient number, since it is larger than the sum of its proper divisors (42461183).

1288985857 is a wasteful number, since it uses less digits than its factorization.

1288985857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its digits is 12902400, while the sum is 61.

The square root of 1288985857 is about 35902.4491782942. The cubic root of 1288985857 is about 1088.3018917086.

The spelling of 1288985857 in words is "one billion, two hundred eighty-eight million, nine hundred eighty-five thousand, eight hundred fifty-seven".