8421806 has 8 divisors (see below), whose sum is σ = 12871224. Its totient is φ = 4131400.

The previous prime is 8421799. The next prime is 8421821. The reversal of 8421806 is 6081248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39620 + ... + 39831.

It is an arithmetic number, because the mean of its divisors is an integer number (1608903).

Almost surely, 2^8421806 is an apocalyptic number.

8421806 is a deficient number, since it is larger than the sum of its proper divisors (4449418).

8421806 is a wasteful number, since it uses less digits than its factorization.

8421806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79506.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 8421806 is about 2902.0348033750. The cubic root of 8421806 is about 203.4550204746.

The spelling of 8421806 in words is "eight million, four hundred twenty-one thousand, eight hundred six".