400563 has 6 divisors (see below), whose sum is σ = 578604. Its totient is φ = 267036.

The previous prime is 400559. The next prime is 400579. The reversal of 400563 is 365004.

It is a happy number.

It is not a de Polignac number, because 400563 - 2² = 400559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22245 + ... + 22262.

It is an arithmetic number, because the mean of its divisors is an integer number (96434).

2⁴⁰⁰⁵⁶³ is an apocalyptic number.

400563 is a deficient number, since it is larger than the sum of its proper divisors (178041).

400563 is a wasteful number, since it uses less digits than its factorization.

400563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44513 (or 44510 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 400563 is about 632.9004661082. The cubic root of 400563 is about 73.7151822627.

Adding to 400563 its reverse (365004), we get a palindrome (765567).

The spelling of 400563 in words is "four hundred thousand, five hundred sixty-three".