12820173 has 4 divisors (see below), whose sum is σ = 17093568. Its totient is φ = 8546780.

The previous prime is 12820151. The next prime is 12820201. The reversal of 12820173 is 37102821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12820173 - 2¹² = 12816077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820133) 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, 2136693 + ... + 2136698.

It is an arithmetic number, because the mean of its divisors is an integer number (4273392).

Almost surely, 2^12820173 is an apocalyptic number.

It is an amenable number.

12820173 is a deficient number, since it is larger than the sum of its proper divisors (4273395).

12820173 is an equidigital number, since it uses as much as digits as its factorization.

12820173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273394.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12820173 is about 3580.5269165306. The cubic root of 12820173 is about 234.0442424929.

Adding to 12820173 its reverse (37102821), we get a palindrome (49922994).

It can be divided in two parts, 128 and 20173, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 12820173 in words is "twelve million, eight hundred twenty thousand, one hundred seventy-three".