1299143799 has 16 divisors (see below), whose sum is σ = 2008339200. Its totient is φ = 828439128.

The previous prime is 1299143789. The next prime is 1299143809. The reversal of 1299143799 is 9973419921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1299143789) and next prime (1299143809).

It is a de Polignac number, because none of the positive numbers 2^k-1299143799 is a prime.

It is a super-2 number, since 2×1299143799² = 3375549220960304802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299143719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1045389 + ... + 1046630.

It is an arithmetic number, because the mean of its divisors is an integer number (125521200).

Almost surely, 2^1299143799 is an apocalyptic number.

1299143799 is a deficient number, since it is larger than the sum of its proper divisors (709195401).

1299143799 is a wasteful number, since it uses less digits than its factorization.

1299143799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092051 (or 2092045 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 1299143799 is about 36043.6374274295. The cubic root of 1299143799 is about 1091.1532274454.

The spelling of 1299143799 in words is "one billion, two hundred ninety-nine million, one hundred forty-three thousand, seven hundred ninety-nine".