212318640 has 60 divisors (see below), whose sum is σ = 713039184. Its totient is φ = 56618112.

The previous prime is 212318633. The next prime is 212318647. The reversal of 212318640 is 46813212.

212318640 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 18 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (212318633) and next prime (212318647).

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (212318647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146724 + ... + 148163.

Almost surely, 2^212318640 is an apocalyptic number.

212318640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212318640 is an abundant number, since it is smaller than the sum of its proper divisors (500720544).

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

212318640 is a wasteful number, since it uses less digits than its factorization.

212318640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294906 (or 294897 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 212318640 is about 14571.1578126105. The cubic root of 212318640 is about 596.5717828515.

The spelling of 212318640 in words is "two hundred twelve million, three hundred eighteen thousand, six hundred forty".