12640273 has 4 divisors (see below), whose sum is σ = 12981940. Its totient is φ = 12298608.

The previous prime is 12640261. The next prime is 12640283. The reversal of 12640273 is 37204621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37204621 = 1657 ⋅22453.

It can be written as a sum of positive squares in 2 ways, for example, as 5414929 + 7225344 = 2327^2 + 2688^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640273 - 2⁵ = 12640241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170778 + ... + 170851.

It is an arithmetic number, because the mean of its divisors is an integer number (3245485).

Almost surely, 2^12640273 is an apocalyptic number.

It is an amenable number.

12640273 is a deficient number, since it is larger than the sum of its proper divisors (341667).

12640273 is an equidigital number, since it uses as much as digits as its factorization.

12640273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341666.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 12640273 is about 3555.3161603435. The cubic root of 12640273 is about 232.9443339300.

Adding to 12640273 its reverse (37204621), we get a palindrome (49844894).

The spelling of 12640273 in words is "twelve million, six hundred forty thousand, two hundred seventy-three".