400822 has 8 divisors (see below), whose sum is σ = 607176. Its totient is φ = 198432.

The previous prime is 400759. The next prime is 400823. The reversal of 400822 is 228004.

400822 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 400796 and 400805.

It is a congruent number.

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

400822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 723 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (75897).

2⁴⁰⁰⁸²² is an apocalyptic number.

400822 is a deficient number, since it is larger than the sum of its proper divisors (206354).

400822 is a wasteful number, since it uses less digits than its factorization.

400822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400822 is about 633.1050465760. The cubic root of 400822 is about 73.7310666710.

Adding to 400822 its reverse (228004), we get a palindrome (628826).

The spelling of 400822 in words is "four hundred thousand, eight hundred twenty-two".