12649999 has 4 divisors (see below), whose sum is σ = 12828240. Its totient is φ = 12471760.

The previous prime is 12649993. The next prime is 12650021. The reversal of 12649999 is 99994621.

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 12649999 - 2⁹ = 12649487 is a prime.

It is a Duffinian number.

12649999 is a modest number, since divided by 9999 gives 1264 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649993) 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, 89014 + ... + 89155.

It is an arithmetic number, because the mean of its divisors is an integer number (3207060).

Almost surely, 2^12649999 is an apocalyptic number.

12649999 is a deficient number, since it is larger than the sum of its proper divisors (178241).

12649999 is an equidigital number, since it uses as much as digits as its factorization.

12649999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178240.

The product of its digits is 314928, while the sum is 49.

The square root of 12649999 is about 3556.6837081754. The cubic root of 12649999 is about 233.0040645954.

The spelling of 12649999 in words is "twelve million, six hundred forty-nine thousand, nine hundred ninety-nine".