1299926879 has 4 divisors (see below), whose sum is σ = 1376393184. Its totient is φ = 1223460576.

The previous prime is 1299926861. The next prime is 1299926891. The reversal of 1299926879 is 9786299921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1299926879 - 2²⁸ = 1031491423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299926839) 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, 38233127 + ... + 38233160.

It is an arithmetic number, because the mean of its divisors is an integer number (344098296).

Almost surely, 2^1299926879 is an apocalyptic number.

1299926879 is a deficient number, since it is larger than the sum of its proper divisors (76466305).

1299926879 is an equidigital number, since it uses as much as digits as its factorization.

1299926879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76466304.

The product of its digits is 8817984, while the sum is 62.

The square root of 1299926879 is about 36054.4987345546. The cubic root of 1299926879 is about 1091.3724201803.

The spelling of 1299926879 in words is "one billion, two hundred ninety-nine million, nine hundred twenty-six thousand, eight hundred seventy-nine".