8420646 has 32 divisors (see below), whose sum is σ = 18355680. Its totient is φ = 2559744.

The previous prime is 8420603. The next prime is 8420651. The reversal of 8420646 is 6460248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6336 + ... + 7548.

It is an arithmetic number, because the mean of its divisors is an integer number (573615).

Almost surely, 2^8420646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9177840).

8420646 is an abundant number, since it is smaller than the sum of its proper divisors (9935034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8420646 is a wasteful number, since it uses less digits than its factorization.

8420646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 8420646 is about 2901.8349367254. The cubic root of 8420646 is about 203.4456789051.

The spelling of 8420646 in words is "eight million, four hundred twenty thousand, six hundred forty-six".