212817992 has 32 divisors (see below), whose sum is σ = 403972920. Its totient is φ = 105100800.

The previous prime is 212817991. The next prime is 212818033. The reversal of 212817992 is 299718212.

It can be written as a sum of positive squares in 4 ways, for example, as 191158276 + 21659716 = 13826^2 + 4654^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (212817991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303242 + ... + 303942.

Almost surely, 2^212817992 is an apocalyptic number.

It is an amenable number.

212817992 is a deficient number, since it is larger than the sum of its proper divisors (191154928).

212817992 is a wasteful number, since it uses less digits than its factorization.

212817992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1117 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 212817992 is about 14588.2826953689. The cubic root of 212817992 is about 597.0391088708.

The spelling of 212817992 in words is "two hundred twelve million, eight hundred seventeen thousand, nine hundred ninety-two".