8421646 has 16 divisors (see below), whose sum is σ = 13362048. Its totient is φ = 3974400.

The previous prime is 8421641. The next prime is 8421653. The reversal of 8421646 is 6461248.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (835128).

Almost surely, 2^8421646 is an apocalyptic number.

8421646 is a deficient number, since it is larger than the sum of its proper divisors (4940402).

8421646 is a wasteful number, since it uses less digits than its factorization.

8421646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387.

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

The square root of 8421646 is about 2902.0072363797. The cubic root of 8421646 is about 203.4537320333.

It can be divided in two parts, 84216 and 46, that multiplied together give a triangular number (3873936 = T₂₇₈₃).

The spelling of 8421646 in words is "eight million, four hundred twenty-one thousand, six hundred forty-six".