12785421 has 8 divisors (see below), whose sum is σ = 18597024. Its totient is φ = 7748720.

The previous prime is 12785419. The next prime is 12785449. The reversal of 12785421 is 12458721.

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 12785421 - 2¹ = 12785419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12785021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193686 + ... + 193751.

It is an arithmetic number, because the mean of its divisors is an integer number (2324628).

Almost surely, 2^12785421 is an apocalyptic number.

12785421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12785421 is a deficient number, since it is larger than the sum of its proper divisors (5811603).

12785421 is a wasteful number, since it uses less digits than its factorization.

12785421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387451.

The product of its digits is 4480, while the sum is 30.

The square root of 12785421 is about 3575.6707063151. The cubic root of 12785421 is about 233.8325743705.

The spelling of 12785421 in words is "twelve million, seven hundred eighty-five thousand, four hundred twenty-one".