12699999 has 48 divisors (see below), whose sum is σ = 21621600. Its totient is φ = 7112448.

The previous prime is 12699997. The next prime is 12700001. The reversal of 12699999 is 99999621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12699997) and next prime (12700001).

It is not a de Polignac number, because 12699999 - 2¹ = 12699997 is a prime.

It is a super-2 number, since 2×12699999² = 322579949200002, which contains 22 as substring.

12699999 is a modest number, since divided by 9999 gives 1269 as remainder.

It is a plaindrome in base 5 and base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64369 + ... + 64565.

It is an arithmetic number, because the mean of its divisors is an integer number (450450).

Almost surely, 2^12699999 is an apocalyptic number.

12699999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12699999 is a deficient number, since it is larger than the sum of its proper divisors (8921601).

12699999 is a wasteful number, since it uses less digits than its factorization.

12699999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 261 counting only the distinct ones).

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

The square root of 12699999 is about 3563.7057959377. The cubic root of 12699999 is about 233.3106492687.

The spelling of 12699999 in words is "twelve million, six hundred ninety-nine thousand, nine hundred ninety-nine".