1299104639 has 16 divisors (see below), whose sum is σ = 1524096000. Its totient is φ = 1084079040.

The previous prime is 1299104633. The next prime is 1299104641. The reversal of 1299104639 is 9364019921.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299104639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1299104639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299104633) 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, 139862 + ... + 148860.

It is an arithmetic number, because the mean of its divisors is an integer number (95256000).

Almost surely, 2^1299104639 is an apocalyptic number.

1299104639 is a deficient number, since it is larger than the sum of its proper divisors (224991361).

1299104639 is an equidigital number, since it uses as much as digits as its factorization.

1299104639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1299104639 is about 36043.0941929241. The cubic root of 1299104639 is about 1091.1422638169.

The spelling of 1299104639 in words is "one billion, two hundred ninety-nine million, one hundred four thousand, six hundred thirty-nine".