12640867 has 2 divisors, whose sum is σ = 12640868. Its totient is φ = 12640866.

The previous prime is 12640841. The next prime is 12640879. The reversal of 12640867 is 76804621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12640867 is a prime.

It is not a weakly prime, because it can be changed into another prime (12640807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320433 + 6320434.

It is an arithmetic number, because the mean of its divisors is an integer number (6320434).

Almost surely, 2^12640867 is an apocalyptic number.

12640867 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640867 is an equidigital number, since it uses as much as digits as its factorization.

12640867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 12640867 is about 3555.3996962367. The cubic root of 12640867 is about 232.9479827638.

The spelling of 12640867 in words is "twelve million, six hundred forty thousand, eight hundred sixty-seven".