1285868916 has 36 divisors (see below), whose sum is σ = 3441591972. Its totient is φ = 403409664.

The previous prime is 1285868897. The next prime is 1285868921. The reversal of 1285868916 is 6198685821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 976812516 + 309056400 = 31254^2 + 17580^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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, 1049935 + ... + 1051158.

It is an arithmetic number, because the mean of its divisors is an integer number (95599777).

Almost surely, 2^1285868916 is an apocalyptic number.

It is an amenable number.

1285868916 is an abundant number, since it is smaller than the sum of its proper divisors (2155723056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285868916 is a wasteful number, since it uses less digits than its factorization.

1285868916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101120 (or 2101115 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 1285868916 is about 35859.0144315206. The cubic root of 1285868916 is about 1087.4239636097.

The spelling of 1285868916 in words is "one billion, two hundred eighty-five million, eight hundred sixty-eight thousand, nine hundred sixteen".