12899947 has 4 divisors (see below), whose sum is σ = 12936240. Its totient is φ = 12863656.

The previous prime is 12899899. The next prime is 12899951. The reversal of 12899947 is 74999821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12899947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12899947.

It is not an unprimeable number, because it can be changed into a prime (12899977) 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 3 ways as a sum of consecutive naturals, for example, 17608 + ... + 18325.

It is an arithmetic number, because the mean of its divisors is an integer number (3234060).

Almost surely, 2^12899947 is an apocalyptic number.

12899947 is a deficient number, since it is larger than the sum of its proper divisors (36293).

12899947 is an equidigital number, since it uses as much as digits as its factorization.

12899947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36292.

The product of its digits is 326592, while the sum is 49.

The square root of 12899947 is about 3591.6496209959. The cubic root of 12899947 is about 234.5286886976.

It can be divided in two parts, 1289 and 9947, that added together give a square (11236 = 106²).

The spelling of 12899947 in words is "twelve million, eight hundred ninety-nine thousand, nine hundred forty-seven".