400311202212 has 18 divisors (see below), whose sum is σ = 1011897761238. Its totient is φ = 133437067392.

The previous prime is 400311202201. The next prime is 400311202289. The reversal of 400311202212 is 212202113004.

It is a happy number.

400311202212 is a `hidden beast` number, since 400 + 31 + 1 + 20 + 2 + 212 = 666.

It can be written as a sum of positive squares in only one way, i.e., 212773703076 + 187537499136 = 461274^2 + 433056^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5559877773 + ... + 5559877844.

It is an arithmetic number, because the mean of its divisors is an integer number (56216542291).

Almost surely, 2^400311202212 is an apocalyptic number.

It is an amenable number.

400311202212 is an abundant number, since it is smaller than the sum of its proper divisors (611586559026).

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

400311202212 is a wasteful number, since it uses less digits than its factorization.

400311202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11119755627 (or 11119755622 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 400311202212 its reverse (212202113004), we get a palindrome (612513315216).

The spelling of 400311202212 in words is "four hundred billion, three hundred eleven million, two hundred two thousand, two hundred twelve".