12392821 has 8 divisors (see below), whose sum is σ = 14395904. Its totient is φ = 10447920.

The previous prime is 12392803. The next prime is 12392827. The reversal of 12392821 is 12829321.

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

It is not a de Polignac number, because 12392821 - 2²¹ = 10295669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12392821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12392827) 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, 14085 + ... + 14938.

It is an arithmetic number, because the mean of its divisors is an integer number (1799488).

Almost surely, 2^12392821 is an apocalyptic number.

It is an amenable number.

12392821 is a deficient number, since it is larger than the sum of its proper divisors (2003083).

12392821 is an equidigital number, since it uses as much as digits as its factorization.

12392821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29091.

The product of its digits is 1728, while the sum is 28.

The square root of 12392821 is about 3520.3438752486. The cubic root of 12392821 is about 231.4142289941.

The spelling of 12392821 in words is "twelve million, three hundred ninety-two thousand, eight hundred twenty-one".