400000212 has 18 divisors (see below), whose sum is σ = 1011111738. Its totient is φ = 133333392.

The previous prime is 400000193. The next prime is 400000261. The reversal of 400000212 is 212000004.

It can be written as a sum of positive squares in only one way, i.e., 398241936 + 1758276 = 19956^2 + 1326^2 .

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 (9).

It is a junction number, because it is equal to n+sod(n) for n = 400000194 and 400000203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5555523 + ... + 5555594.

Almost surely, 2^400000212 is an apocalyptic number.

It is an amenable number.

400000212 is an abundant number, since it is smaller than the sum of its proper divisors (611111526).

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

400000212 is a wasteful number, since it uses less digits than its factorization.

400000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111127 (or 11111122 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 400000212 is about 20000.0052999993. The cubic root of 400000212 is about 736.8064298972.

Adding to 400000212 its reverse (212000004), we get a palindrome (612000216).

The spelling of 400000212 in words is "four hundred million, two hundred twelve", and thus it is an aban number.