1299139969 has 8 divisors (see below), whose sum is σ = 1309933152. Its totient is φ = 1288360320.

The previous prime is 1299139957. The next prime is 1299139973. The reversal of 1299139969 is 9699319921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1299139969 - 2⁵ = 1299139937 is a prime.

It is a super-2 number, since 2×1299139969² = 3375529318106641922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299139979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295582 + ... + 299944.

It is an arithmetic number, because the mean of its divisors is an integer number (163741644).

Almost surely, 2^1299139969 is an apocalyptic number.

It is an amenable number.

1299139969 is a deficient number, since it is larger than the sum of its proper divisors (10793183).

1299139969 is a wasteful number, since it uses less digits than its factorization.

1299139969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767.

The product of its digits is 2125764, while the sum is 58.

The square root of 1299139969 is about 36043.5842973476. The cubic root of 1299139969 is about 1091.1521551697.

The spelling of 1299139969 in words is "one billion, two hundred ninety-nine million, one hundred thirty-nine thousand, nine hundred sixty-nine".