8435821 has 2 divisors, whose sum is σ = 8435822. Its totient is φ = 8435820.

The previous prime is 8435797. The next prime is 8435827. The reversal of 8435821 is 1285348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 2842596 = 2365^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 8435821 - 2⁹ = 8435309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8435827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4217910 + 4217911.

It is an arithmetic number, because the mean of its divisors is an integer number (4217911).

Almost surely, 2^8435821 is an apocalyptic number.

It is an amenable number.

8435821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8435821 is an equidigital number, since it uses as much as digits as its factorization.

8435821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 8435821 is about 2904.4484846525. The cubic root of 8435821 is about 203.5678166238.

The spelling of 8435821 in words is "eight million, four hundred thirty-five thousand, eight hundred twenty-one".