1299985866 has 24 divisors (see below), whose sum is σ = 2843986080. Its totient is φ = 429120936.

The previous prime is 1299985853. The next prime is 1299985891. The reversal of 1299985866 is 6685899921.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348736 + ... + 352443.

It is an arithmetic number, because the mean of its divisors is an integer number (118499420).

Almost surely, 2^1299985866 is an apocalyptic number.

1299985866 is an abundant number, since it is smaller than the sum of its proper divisors (1544000214).

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

1299985866 is a wasteful number, since it uses less digits than its factorization.

1299985866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701290 (or 701287 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The square root of 1299985866 is about 36055.3167507928. The cubic root of 1299985866 is about 1091.3889277270.

The spelling of 1299985866 in words is "one billion, two hundred ninety-nine million, nine hundred eighty-five thousand, eight hundred sixty-six".