400005212 has 6 divisors (see below), whose sum is σ = 700009128. Its totient is φ = 200002604.

The previous prime is 400005211. The next prime is 400005227. The reversal of 400005212 is 212500004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400005211) by changing a digit.

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 as a sum of consecutive naturals, namely, 50000648 + ... + 50000655.

It is an arithmetic number, because the mean of its divisors is an integer number (116668188).

Almost surely, 2^400005212 is an apocalyptic number.

It is an amenable number.

400005212 is a deficient number, since it is larger than the sum of its proper divisors (300003916).

400005212 is a wasteful number, since it uses less digits than its factorization.

400005212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100001307 (or 100001305 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 400005212 is about 20000.1302995756. The cubic root of 400005212 is about 736.8094999095.

Adding to 400005212 its reverse (212500004), we get a palindrome (612505216).

The spelling of 400005212 in words is "four hundred million, five thousand, two hundred twelve".