406565 has 16 divisors (see below), whose sum is σ = 523776. Its totient is φ = 302400.

The previous prime is 406561. The next prime is 406573. The reversal of 406565 is 565604.

It is not a de Polignac number, because 406565 - 2² = 406561 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406565.

It is not an unprimeable number, because it can be changed into a prime (406561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6635 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (32736).

2⁴⁰⁶⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

406565 is a deficient number, since it is larger than the sum of its proper divisors (117211).

406565 is a wasteful number, since it uses less digits than its factorization.

406565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 406565 is about 637.6244976473. The cubic root of 406565 is about 74.0815390471.

The spelling of 406565 in words is "four hundred six thousand, five hundred sixty-five".