12640207 has 2 divisors, whose sum is σ = 12640208. Its totient is φ = 12640206.

The previous prime is 12640193. The next prime is 12640211. The reversal of 12640207 is 70204621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12640207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320103 + 6320104.

It is an arithmetic number, because the mean of its divisors is an integer number (6320104).

Almost surely, 2^12640207 is an apocalyptic number.

12640207 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640207 is an equidigital number, since it uses as much as digits as its factorization.

12640207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 12640207 is about 3555.3068784565. The cubic root of 12640207 is about 232.9439284969.

Adding to 12640207 its reverse (70204621), we get a palindrome (82844828).

The spelling of 12640207 in words is "twelve million, six hundred forty thousand, two hundred seven".