8421406 has 16 divisors (see below), whose sum is σ = 14493024. Its totient is φ = 3595104.

The previous prime is 8421403. The next prime is 8421407. The reversal of 8421406 is 6041248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421403) 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, 3076 + ... + 5128.

It is an arithmetic number, because the mean of its divisors is an integer number (905814).

Almost surely, 2^8421406 is an apocalyptic number.

8421406 is a deficient number, since it is larger than the sum of its proper divisors (6071618).

8421406 is a wasteful number, since it uses less digits than its factorization.

8421406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 8421406 is about 2901.9658853956. The cubic root of 8421406 is about 203.4517993407.

The spelling of 8421406 in words is "eight million, four hundred twenty-one thousand, four hundred six".