1299895139 has 4 divisors (see below), whose sum is σ = 1321927320. Its totient is φ = 1277862960.

The previous prime is 1299895133. The next prime is 1299895141. The reversal of 1299895139 is 9315989921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299895139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299895133) 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, 11016002 + ... + 11016119.

It is an arithmetic number, because the mean of its divisors is an integer number (330481830).

Almost surely, 2^1299895139 is an apocalyptic number.

1299895139 is a deficient number, since it is larger than the sum of its proper divisors (22032181).

1299895139 is an equidigital number, since it uses as much as digits as its factorization.

1299895139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22032180.

The product of its digits is 1574640, while the sum is 56.

The square root of 1299895139 is about 36054.0585648828. The cubic root of 1299895139 is about 1091.3635375159.

The spelling of 1299895139 in words is "one billion, two hundred ninety-nine million, eight hundred ninety-five thousand, one hundred thirty-nine".