212939844 has 48 divisors (see below), whose sum is σ = 540122688. Its totient is φ = 64902528.

The previous prime is 212939813. The next prime is 212939879. The reversal of 212939844 is 448939212.

It is a junction number, because it is equal to n+sod(n) for n = 212939796 and 212939805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10314 + ... + 23070.

It is an arithmetic number, because the mean of its divisors is an integer number (11252556).

Almost surely, 2^212939844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212939844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270061344).

212939844 is an abundant number, since it is smaller than the sum of its proper divisors (327182844).

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

212939844 is a wasteful number, since it uses less digits than its factorization.

212939844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884 (or 12882 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 212939844 is about 14592.4584631926. The cubic root of 212939844 is about 597.1530349044.

The spelling of 212939844 in words is "two hundred twelve million, nine hundred thirty-nine thousand, eight hundred forty-four".