212445400 has 48 divisors (see below), whose sum is σ = 494990640. Its totient is φ = 84796800.

The previous prime is 212445383. The next prime is 212445421. The reversal of 212445400 is 4544212.

It is a happy number.

212445400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 131397 + ... + 133003.

It is an arithmetic number, because the mean of its divisors is an integer number (10312305).

Almost surely, 2^212445400 is an apocalyptic number.

212445400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212445400 is an abundant number, since it is smaller than the sum of its proper divisors (282545240).

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

212445400 is a wasteful number, since it uses less digits than its factorization.

212445400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2275 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 212445400 is about 14575.5068522505. The cubic root of 212445400 is about 596.6904824231.

Adding to 212445400 its reverse (4544212), we get a palindrome (216989612).

It can be divided in two parts, 2124 and 45400, that added together give a square (47524 = 218²).

The spelling of 212445400 in words is "two hundred twelve million, four hundred forty-five thousand, four hundred".