12649279 has 4 divisors (see below), whose sum is σ = 12957840. Its totient is φ = 12340720.

The previous prime is 12649277. The next prime is 12649291. The reversal of 12649279 is 97294621.

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 12649279 - 2¹ = 12649277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649277) 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 3 ways as a sum of consecutive naturals, for example, 154219 + ... + 154300.

It is an arithmetic number, because the mean of its divisors is an integer number (3239460).

Almost surely, 2^12649279 is an apocalyptic number.

12649279 is a deficient number, since it is larger than the sum of its proper divisors (308561).

12649279 is an equidigital number, since it uses as much as digits as its factorization.

12649279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308560.

The product of its digits is 54432, while the sum is 40.

The square root of 12649279 is about 3556.5824888508. The cubic root of 12649279 is about 232.9996438807. Note that the first 3 decimals are identical.

The spelling of 12649279 in words is "twelve million, six hundred forty-nine thousand, two hundred seventy-nine".