404647 has 4 divisors (see below), whose sum is σ = 407160. Its totient is φ = 402136.

The previous prime is 404597. The next prime is 404671. The reversal of 404647 is 746404.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404647 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (434647) 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, 997 + ... + 1342.

It is an arithmetic number, because the mean of its divisors is an integer number (101790).

2⁴⁰⁴⁶⁴⁷ is an apocalyptic number.

404647 is a deficient number, since it is larger than the sum of its proper divisors (2513).

404647 is a wasteful number, since it uses less digits than its factorization.

404647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 404647 is about 636.1186996151. The cubic root of 404647 is about 73.9648603554.

The spelling of 404647 in words is "four hundred four thousand, six hundred forty-seven".