1299080639 has 4 divisors (see below), whose sum is σ = 1310998920. Its totient is φ = 1287162360.

The previous prime is 1299080623. The next prime is 1299080659. The reversal of 1299080639 is 9360809921.

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 1299080639 - 2⁴ = 1299080623 is a prime.

It is a super-2 number, since 2×1299080639² = 3375221013249296642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1299080593 and 1299080602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299080609) 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, 5958977 + ... + 5959194.

It is an arithmetic number, because the mean of its divisors is an integer number (327749730).

Almost surely, 2^1299080639 is an apocalyptic number.

1299080639 is a deficient number, since it is larger than the sum of its proper divisors (11918281).

1299080639 is a wasteful number, since it uses less digits than its factorization.

1299080639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918280.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1299080639 is about 36042.7612565963. The cubic root of 1299080639 is about 1091.1355444261.

The spelling of 1299080639 in words is "one billion, two hundred ninety-nine million, eighty thousand, six hundred thirty-nine".