1299189789 has 12 divisors (see below), whose sum is σ = 1884397372. Its totient is φ = 862531200.

The previous prime is 1299189761. The next prime is 1299189791. The reversal of 1299189789 is 9879819921.

It can be written as a sum of positive squares in 2 ways, for example, as 989605764 + 309584025 = 31458^2 + 17595^2 .

It is not a de Polignac number, because 1299189789 - 2⁸ = 1299189533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299189719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297322 + ... + 301659.

Almost surely, 2^1299189789 is an apocalyptic number.

It is an amenable number.

1299189789 is a deficient number, since it is larger than the sum of its proper divisors (585207583).

1299189789 is a wasteful number, since it uses less digits than its factorization.

1299189789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599228 (or 599225 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 63.

The square root of 1299189789 is about 36044.2753984596. The cubic root of 1299189789 is about 1091.1661029882.

The spelling of 1299189789 in words is "one billion, two hundred ninety-nine million, one hundred eighty-nine thousand, seven hundred eighty-nine".