213697812 has 12 divisors (see below), whose sum is σ = 498628256. Its totient is φ = 71232600.

The previous prime is 213697789. The next prime is 213697873. The reversal of 213697812 is 218796312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8904064 + ... + 8904087.

Almost surely, 2^213697812 is an apocalyptic number.

It is an amenable number.

213697812 is an abundant number, since it is smaller than the sum of its proper divisors (284930444).

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

213697812 is a wasteful number, since it uses less digits than its factorization.

213697812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808158 (or 17808156 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 213697812 is about 14618.4066163177. The cubic root of 213697812 is about 597.8607260210.

The spelling of 213697812 in words is "two hundred thirteen million, six hundred ninety-seven thousand, eight hundred twelve".