12642247 has 4 divisors (see below), whose sum is σ = 12669120. Its totient is φ = 12615376.

The previous prime is 12642211. The next prime is 12642263. The reversal of 12642247 is 74224621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74224621 = 19 ⋅3906559.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642247 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642547) 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, 12718 + ... + 13675.

It is an arithmetic number, because the mean of its divisors is an integer number (3167280).

Almost surely, 2^12642247 is an apocalyptic number.

12642247 is a deficient number, since it is larger than the sum of its proper divisors (26873).

12642247 is an equidigital number, since it uses as much as digits as its factorization.

12642247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26872.

The product of its digits is 5376, while the sum is 28.

The square root of 12642247 is about 3555.5937619475. The cubic root of 12642247 is about 232.9564594112.

Adding to 12642247 its reverse (74224621), we get a palindrome (86866868).

The spelling of 12642247 in words is "twelve million, six hundred forty-two thousand, two hundred forty-seven".