400565 has 8 divisors (see below), whose sum is σ = 524448. Its totient is φ = 291280.

The previous prime is 400559. The next prime is 400579. The reversal of 400565 is 565004.

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

It is not a de Polignac number, because 400565 - 2¹⁰ = 399541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3587 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (65556).

2⁴⁰⁰⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

400565 is a deficient number, since it is larger than the sum of its proper divisors (123883).

400565 is a wasteful number, since it uses less digits than its factorization.

400565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 400565 is about 632.9020461335. The cubic root of 400565 is about 73.7153049484.

Adding to 400565 its reverse (565004), we get a palindrome (965569).

The spelling of 400565 in words is "four hundred thousand, five hundred sixty-five".