400398222 has 16 divisors (see below), whose sum is σ = 915196032. Its totient is φ = 114399480.

The previous prime is 400398221. The next prime is 400398227. The reversal of 400398222 is 222893004.

It is a super-2 number, since 2×400398222² = 320637472361522568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400398222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400398221) by changing a digit.

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, 4766604 + ... + 4766687.

It is an arithmetic number, because the mean of its divisors is an integer number (57199752).

Almost surely, 2^400398222 is an apocalyptic number.

400398222 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

400398222 is an abundant number, since it is smaller than the sum of its proper divisors (514797810).

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

400398222 is a wasteful number, since it uses less digits than its factorization.

400398222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9533303.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 400398222 is about 20009.9530734082. The cubic root of 400398222 is about 737.0507290303.

It can be divided in two parts, 4003982 and 22, that added together give a palindrome (4004004).

The spelling of 400398222 in words is "four hundred million, three hundred ninety-eight thousand, two hundred twenty-two".