212393812 has 12 divisors (see below), whose sum is σ = 371900340. Its totient is φ = 106136576.

The previous prime is 212393789. The next prime is 212393821. The reversal of 212393812 is 218393212.

It can be written as a sum of positive squares in 2 ways, for example, as 172501956 + 39891856 = 13134^2 + 6316^2 .

It is a super-2 number, since 2×212393812² = 90222262751782688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6637 + ... + 21652.

It is an arithmetic number, because the mean of its divisors is an integer number (30991695).

Almost surely, 2^212393812 is an apocalyptic number.

It is an amenable number.

212393812 is a deficient number, since it is larger than the sum of its proper divisors (159506528).

212393812 is a wasteful number, since it uses less digits than its factorization.

212393812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30170 (or 30168 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 212393812 is about 14573.7370636361. The cubic root of 212393812 is about 596.6421805056.

The spelling of 212393812 in words is "two hundred twelve million, three hundred ninety-three thousand, eight hundred twelve".