12640195 has 8 divisors (see below), whose sum is σ = 15223536. Its totient is φ = 10075296.

The previous prime is 12640193. The next prime is 12640207. The reversal of 12640195 is 59104621.

12640195 = T₁₄₆ + T₁₄₇ + ... + T₄₂₈.

12640195 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12640195 - 2¹ = 12640193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640193) 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 7 ways as a sum of consecutive naturals, for example, 3052 + ... + 5881.

It is an arithmetic number, because the mean of its divisors is an integer number (1902942).

Almost surely, 2^12640195 is an apocalyptic number.

12640195 is a deficient number, since it is larger than the sum of its proper divisors (2583341).

12640195 is an equidigital number, since it uses as much as digits as its factorization.

12640195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9221.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12640195 is about 3555.3051908381. The cubic root of 12640195 is about 232.9438547817.

The spelling of 12640195 in words is "twelve million, six hundred forty thousand, one hundred ninety-five".