803921 has 2 divisors, whose sum is σ = 803922. Its totient is φ = 803920.

The previous prime is 803911. The next prime is 803927. The reversal of 803921 is 129308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 55696 = 865^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 803921 - 2⁶ = 803857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (803927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401960 + 401961.

It is an arithmetic number, because the mean of its divisors is an integer number (401961).

2⁸⁰³⁹²¹ is an apocalyptic number.

It is an amenable number.

803921 is a deficient number, since it is larger than the sum of its proper divisors (1).

803921 is an equidigital number, since it uses as much as digits as its factorization.

803921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 803921 is about 896.6164174272. The cubic root of 803921 is about 92.9831934790.

The spelling of 803921 in words is "eight hundred three thousand, nine hundred twenty-one".