400543 has 8 divisors (see below), whose sum is σ = 470736. Its totient is φ = 336000.

The previous prime is 400523. The next prime is 400559. The reversal of 400543 is 345004.

400543 is nontrivially palindromic in base 7.

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

It is a cyclic number.

It is not a de Polignac number, because 400543 - 2⁹ = 400031 is a prime.

It is a Duffinian number.

400543 is a lucky number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1258 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (58842).

2⁴⁰⁰⁵⁴³ is an apocalyptic number.

400543 is a deficient number, since it is larger than the sum of its proper divisors (70193).

400543 is a wasteful number, since it uses less digits than its factorization.

400543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400543 is about 632.8846656382. The cubic root of 400543 is about 73.7139553827.

Adding to 400543 its reverse (345004), we get a palindrome (745547).

The spelling of 400543 in words is "four hundred thousand, five hundred forty-three".