8420836 has 6 divisors (see below), whose sum is σ = 14736470. Its totient is φ = 4210416.

The previous prime is 8420833. The next prime is 8420837. The reversal of 8420836 is 6380248.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 2689600 = 2394^2 + 1640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8420798 and 8420807.

It is not an unprimeable number, because it can be changed into a prime (8420833) 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 as a sum of consecutive naturals, namely, 1052601 + ... + 1052608.

Almost surely, 2^8420836 is an apocalyptic number.

It is an amenable number.

8420836 is a deficient number, since it is larger than the sum of its proper divisors (6315634).

8420836 is a wasteful number, since it uses less digits than its factorization.

8420836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105213 (or 2105211 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 8420836 is about 2901.8676744469. The cubic root of 8420836 is about 203.4472090485.

The spelling of 8420836 in words is "eight million, four hundred twenty thousand, eight hundred thirty-six".