212440236 has 96 divisors (see below), whose sum is σ = 540546048. Its totient is φ = 64753920.

The previous prime is 212440231. The next prime is 212440289. The reversal of 212440236 is 632044212.

It is not an unprimeable number, because it can be changed into a prime (212440231) 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 31 ways as a sum of consecutive naturals, for example, 724906 + ... + 725198.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^212440236 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 212440236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270273024).

212440236 is an abundant number, since it is smaller than the sum of its proper divisors (328105812).

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

212440236 is a wasteful number, since it uses less digits than its factorization.

212440236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 212440236 is about 14575.3297046756. The cubic root of 212440236 is about 596.6856477148.

Adding to 212440236 its reverse (632044212), we get a palindrome (844484448).

The spelling of 212440236 in words is "two hundred twelve million, four hundred forty thousand, two hundred thirty-six".