406647 has 8 divisors (see below), whose sum is σ = 602480. Its totient is φ = 271080.

The previous prime is 406633. The next prime is 406649. The reversal of 406647 is 746604.

It is not a de Polignac number, because 406647 - 2⁴ = 406631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15061 = 406647 / (4 + 0 + 6 + 6 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7504 + ... + 7557.

It is an arithmetic number, because the mean of its divisors is an integer number (75310).

2⁴⁰⁶⁶⁴⁷ is an apocalyptic number.

406647 is a deficient number, since it is larger than the sum of its proper divisors (195833).

406647 is a wasteful number, since it uses less digits than its factorization.

406647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15070 (or 15064 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 406647 is about 637.6887955735. The cubic root of 406647 is about 74.0865192084.

The spelling of 406647 in words is "four hundred six thousand, six hundred forty-seven".