12820291 has 8 divisors (see below), whose sum is σ = 14468400. Its totient is φ = 11252640.

The previous prime is 12820289. The next prime is 12820303. The reversal of 12820291 is 19202821.

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 12820291 - 2¹ = 12820289 is a prime.

It is a super-2 number, since 2×12820291² = 328719722649362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12820201) 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, 19776 + ... + 20413.

It is an arithmetic number, because the mean of its divisors is an integer number (1808550).

Almost surely, 2^12820291 is an apocalyptic number.

12820291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12820291 is a deficient number, since it is larger than the sum of its proper divisors (1648109).

12820291 is a wasteful number, since it uses less digits than its factorization.

12820291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40229.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12820291 is about 3580.5433945143. The cubic root of 12820291 is about 234.0449605574.

The spelling of 12820291 in words is "twelve million, eight hundred twenty thousand, two hundred ninety-one".