12820389 has 8 divisors (see below), whose sum is σ = 17556000. Its totient is φ = 8315856.

The previous prime is 12820373. The next prime is 12820427. The reversal of 12820389 is 98302821.

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

It is not a de Polignac number, because 12820389 - 2⁴ = 12820373 is a prime.

It is a super-2 number, since 2×12820389² = 328724748222642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57639 + ... + 57860.

It is an arithmetic number, because the mean of its divisors is an integer number (2194500).

Almost surely, 2^12820389 is an apocalyptic number.

It is an amenable number.

12820389 is a deficient number, since it is larger than the sum of its proper divisors (4735611).

12820389 is a wasteful number, since it uses less digits than its factorization.

12820389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115539.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 12820389 is about 3580.5570795618. The cubic root of 12820389 is about 234.0455569128.

The spelling of 12820389 in words is "twelve million, eight hundred twenty thousand, three hundred eighty-nine".