212808840 has 32 divisors (see below), whose sum is σ = 638426880. Its totient is φ = 56748992.

The previous prime is 212808829. The next prime is 212808847. The reversal of 212808840 is 48808212.

It is not an unprimeable number, because it can be changed into a prime (212808847) 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, 886584 + ... + 886823.

It is an arithmetic number, because the mean of its divisors is an integer number (19950840).

Almost surely, 2^212808840 is an apocalyptic number.

212808840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212808840 is an abundant number, since it is smaller than the sum of its proper divisors (425618040).

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

212808840 is a wasteful number, since it uses less digits than its factorization.

212808840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773421 (or 1773417 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 212808840 is about 14587.9690155964. The cubic root of 212808840 is about 597.0305504148.

The spelling of 212808840 in words is "two hundred twelve million, eight hundred eight thousand, eight hundred forty".