400021822 has 4 divisors (see below), whose sum is σ = 600032736. Its totient is φ = 200010910.

The previous prime is 400021813. The next prime is 400021847. The reversal of 400021822 is 228120004.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400021822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100005454 + ... + 100005457.

It is an arithmetic number, because the mean of its divisors is an integer number (150008184).

Almost surely, 2^400021822 is an apocalyptic number.

400021822 is a deficient number, since it is larger than the sum of its proper divisors (200010914).

400021822 is a wasteful number, since it uses less digits than its factorization.

400021822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010913.

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

The square root of 400021822 is about 20000.5455425596. The cubic root of 400021822 is about 736.8196983070.

Adding to 400021822 its reverse (228120004), we get a palindrome (628141826).

The spelling of 400021822 in words is "four hundred million, twenty-one thousand, eight hundred twenty-two".