408647 has 4 divisors (see below), whose sum is σ = 418656. Its totient is φ = 398640.

The previous prime is 408643. The next prime is 408659. The reversal of 408647 is 746804.

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

It is a cyclic number.

It is not a de Polignac number, because 408647 - 2² = 408643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408643) 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, 4943 + ... + 5024.

It is an arithmetic number, because the mean of its divisors is an integer number (104664).

2⁴⁰⁸⁶⁴⁷ is an apocalyptic number.

408647 is a deficient number, since it is larger than the sum of its proper divisors (10009).

408647 is an equidigital number, since it uses as much as digits as its factorization.

408647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10008.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 408647 is about 639.2550351777. The cubic root of 408647 is about 74.2077798116.

The spelling of 408647 in words is "four hundred eight thousand, six hundred forty-seven".