12820477 has 4 divisors (see below), whose sum is σ = 12873916. Its totient is φ = 12767040.

The previous prime is 12820427. The next prime is 12820481. The reversal of 12820477 is 77402821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77402821 = 3643 ⋅21247.

It can be written as a sum of positive squares in 2 ways, for example, as 9308601 + 3511876 = 3051^2 + 1874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12820477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26358 + ... + 26839.

It is an arithmetic number, because the mean of its divisors is an integer number (3218479).

Almost surely, 2^12820477 is an apocalyptic number.

It is an amenable number.

12820477 is a deficient number, since it is larger than the sum of its proper divisors (53439).

12820477 is an equidigital number, since it uses as much as digits as its factorization.

12820477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53438.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 12820477 is about 3580.5693681313. The cubic root of 12820477 is about 234.0460924130.

The spelling of 12820477 in words is "twelve million, eight hundred twenty thousand, four hundred seventy-seven".