12999969 has 6 divisors (see below), whose sum is σ = 18777746. Its totient is φ = 8666640.

The previous prime is 12999967. The next prime is 12999977. The reversal of 12999969 is 96999921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 2030625 = 3312^2 + 1425^2 .

It is not a de Polignac number, because 12999969 - 2¹ = 12999967 is a prime.

It is a super-2 number, since 2×12999969² = 337998388001922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12999967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 722212 + ... + 722229.

Almost surely, 2^12999969 is an apocalyptic number.

It is an amenable number.

12999969 is a deficient number, since it is larger than the sum of its proper divisors (5777777).

12999969 is a wasteful number, since it uses less digits than its factorization.

12999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444447 (or 1444444 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 12999969 is about 3605.5469765349. The cubic root of 12999969 is about 235.1332818710.

The spelling of 12999969 in words is "twelve million, nine hundred ninety-nine thousand, nine hundred sixty-nine".