8420081 has 4 divisors (see below), whose sum is σ = 8443392. Its totient is φ = 8396772.

The previous prime is 8420051. The next prime is 8420119. The reversal of 8420081 is 1800248.

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 a de Polignac number, because none of the positive numbers 2^k-8420081 is a prime.

It is a super-2 number, since 2×8420081² = 141795528093122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420051) 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 in 3 ways as a sum of consecutive naturals, for example, 11105 + ... + 11838.

It is an arithmetic number, because the mean of its divisors is an integer number (2110848).

Almost surely, 2^8420081 is an apocalyptic number.

It is an amenable number.

8420081 is a deficient number, since it is larger than the sum of its proper divisors (23311).

8420081 is a wasteful number, since it uses less digits than its factorization.

8420081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23310.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 8420081 is about 2901.7375828975. The cubic root of 8420081 is about 203.4411286057.

The spelling of 8420081 in words is "eight million, four hundred twenty thousand, eighty-one".