1299989841 has 4 divisors (see below), whose sum is σ = 1733319792. Its totient is φ = 866659892.

The previous prime is 1299989839. The next prime is 1299989851. The reversal of 1299989841 is 1489899921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1299989841 - 2¹ = 1299989839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1299989851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216664971 + ... + 216664976.

It is an arithmetic number, because the mean of its divisors is an integer number (433329948).

Almost surely, 2^1299989841 is an apocalyptic number.

It is an amenable number.

1299989841 is a deficient number, since it is larger than the sum of its proper divisors (433329951).

1299989841 is an equidigital number, since it uses as much as digits as its factorization.

1299989841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433329950.

The product of its digits is 3359232, while the sum is 60.

The square root of 1299989841 is about 36055.3718743823. The cubic root of 1299989841 is about 1091.3900401152.

The spelling of 1299989841 in words is "one billion, two hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred forty-one".