1299857889 has 8 divisors (see below), whose sum is σ = 1890702432. Its totient is φ = 787792640.

The previous prime is 1299857873. The next prime is 1299857899. The reversal of 1299857889 is 9887589921.

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 1299857889 - 2⁴ = 1299857873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1299857899) 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, 19694784 + ... + 19694849.

It is an arithmetic number, because the mean of its divisors is an integer number (236337804).

Almost surely, 2^1299857889 is an apocalyptic number.

It is an amenable number.

1299857889 is a deficient number, since it is larger than the sum of its proper divisors (590844543).

1299857889 is a wasteful number, since it uses less digits than its factorization.

1299857889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39389647.

The product of its digits is 26127360, while the sum is 66.

The square root of 1299857889 is about 36053.5419757893. The cubic root of 1299857889 is about 1091.3531126545.

The spelling of 1299857889 in words is "one billion, two hundred ninety-nine million, eight hundred fifty-seven thousand, eight hundred eighty-nine".