400022812 has 24 divisors (see below), whose sum is σ = 805150304. Its totient is φ = 170344512.

The previous prime is 400022809. The next prime is 400022837. The reversal of 400022812 is 218220004.

It is a self number, because there is not a number n which added to its sum of digits gives 400022812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41103 + ... + 49894.

Almost surely, 2^400022812 is an apocalyptic number.

It is an amenable number.

400022812 is an abundant number, since it is smaller than the sum of its proper divisors (405127492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400022812 is a wasteful number, since it uses less digits than its factorization.

400022812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91165 (or 91163 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 400022812 is about 20000.5702918692. The cubic root of 400022812 is about 736.8203061496.

Adding to 400022812 its reverse (218220004), we get a palindrome (618242816).

The spelling of 400022812 in words is "four hundred million, twenty-two thousand, eight hundred twelve".