10439821 has 4 divisors (see below), whose sum is σ = 11931232. Its totient is φ = 8948412.

The previous prime is 10439813. The next prime is 10439827. The reversal of 10439821 is 12893401.

It is a happy number.

10439821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10439821 - 2³ = 10439813 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 10439821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10439827) 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 3 ways as a sum of consecutive naturals, for example, 745695 + ... + 745708.

It is an arithmetic number, because the mean of its divisors is an integer number (2982808).

Almost surely, 2^10439821 is an apocalyptic number.

It is an amenable number.

10439821 is a deficient number, since it is larger than the sum of its proper divisors (1491411).

10439821 is an equidigital number, since it uses as much as digits as its factorization.

10439821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491410.

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

The square root of 10439821 is about 3231.0711846074. The cubic root of 10439821 is about 218.5568138213.

The spelling of 10439821 in words is "ten million, four hundred thirty-nine thousand, eight hundred twenty-one".