8640406 has 8 divisors (see below), whose sum is σ = 13173264. Its totient is φ = 4249320.

The previous prime is 8640391. The next prime is 8640407. The reversal of 8640406 is 6040468.

8640406 = 53² + 54² + ... + 296².

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35290 + ... + 35533.

It is an arithmetic number, because the mean of its divisors is an integer number (1646658).

Almost surely, 2^8640406 is an apocalyptic number.

8640406 is a deficient number, since it is larger than the sum of its proper divisors (4532858).

8640406 is a wasteful number, since it uses less digits than its factorization.

8640406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70886.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 8640406 is about 2939.4567525310. The cubic root of 8640406 is about 205.2003276723.

The spelling of 8640406 in words is "eight million, six hundred forty thousand, four hundred six".