400863 has 8 divisors (see below), whose sum is σ = 546048. Its totient is φ = 261464.

The previous prime is 400859. The next prime is 400871. The reversal of 400863 is 368004.

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 400863 - 2² = 400859 is a prime.

It is a super-2 number, since 2×400863² = 321382289538, which contains 22 as substring.

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 400863.

It is not an unprimeable number, because it can be changed into a prime (400823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281 + ... + 1562.

It is an arithmetic number, because the mean of its divisors is an integer number (68256).

2⁴⁰⁰⁸⁶³ is an apocalyptic number.

400863 is a deficient number, since it is larger than the sum of its proper divisors (145185).

400863 is a wasteful number, since it uses less digits than its factorization.

400863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 400863 is about 633.1374258406. The cubic root of 400863 is about 73.7335805638.

Adding to 400863 its reverse (368004), we get a palindrome (768867).

The spelling of 400863 in words is "four hundred thousand, eight hundred sixty-three".