1287966844 has 12 divisors (see below), whose sum is σ = 2254378000. Its totient is φ = 643858848.

The previous prime is 1287966829. The next prime is 1287966863. The reversal of 1287966844 is 4486697821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5544 + ... + 51055.

Almost surely, 2^1287966844 is an apocalyptic number.

It is an amenable number.

1287966844 is a deficient number, since it is larger than the sum of its proper divisors (966411156).

1287966844 is a wasteful number, since it uses less digits than its factorization.

1287966844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62292 (or 62290 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The square root of 1287966844 is about 35888.2549589695. The cubic root of 1287966844 is about 1088.0150289428.

The spelling of 1287966844 in words is "one billion, two hundred eighty-seven million, nine hundred sixty-six thousand, eight hundred forty-four".