8406643 has 4 divisors (see below), whose sum is σ = 9607600. Its totient is φ = 7205688.

The previous prime is 8406637. The next prime is 8406649. The reversal of 8406643 is 3466048.

8406643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8406637) and next prime (8406649).

It is not a de Polignac number, because 8406643 - 2¹³ = 8398451 is a prime.

It is a super-3 number, since 3×8406643³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8406649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600468 + ... + 600481.

It is an arithmetic number, because the mean of its divisors is an integer number (2401900).

Almost surely, 2^8406643 is an apocalyptic number.

8406643 is a deficient number, since it is larger than the sum of its proper divisors (1200957).

8406643 is a wasteful number, since it uses less digits than its factorization.

8406643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200956.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 8406643 is about 2899.4211491261. The cubic root of 8406643 is about 203.3328439177.

The spelling of 8406643 in words is "eight million, four hundred six thousand, six hundred forty-three".