12247639 has 4 divisors (see below), whose sum is σ = 12258000. Its totient is φ = 12237280.

The previous prime is 12247637. The next prime is 12247649. The reversal of 12247639 is 93674221.

12247639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93674221 = 9239 ⋅10139.

It is a cyclic number.

It is not a de Polignac number, because 12247639 - 2¹ = 12247637 is a prime.

It is a super-2 number, since 2×12247639² = 300009322148642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12247637) 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, 3139 + ... + 5860.

It is an arithmetic number, because the mean of its divisors is an integer number (3064500).

Almost surely, 2^12247639 is an apocalyptic number.

12247639 is a deficient number, since it is larger than the sum of its proper divisors (10361).

12247639 is an equidigital number, since it uses as much as digits as its factorization.

12247639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10360.

The product of its digits is 18144, while the sum is 34.

The square root of 12247639 is about 3499.6626980325. The cubic root of 12247639 is about 230.5070038009.

The spelling of 12247639 in words is "twelve million, two hundred forty-seven thousand, six hundred thirty-nine".