212403306 has 16 divisors (see below), whose sum is σ = 429580800. Its totient is φ = 70005408.

The previous prime is 212403283. The next prime is 212403307. The reversal of 212403306 is 603304212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (212403307) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 198346 + ... + 199413.

It is an arithmetic number, because the mean of its divisors is an integer number (26848800).

Almost surely, 2^212403306 is an apocalyptic number.

212403306 is an abundant number, since it is smaller than the sum of its proper divisors (217177494).

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

212403306 is a wasteful number, since it uses less digits than its factorization.

212403306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397853.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 212403306 is about 14574.0627829031. The cubic root of 212403306 is about 596.6510703385.

Adding to 212403306 its reverse (603304212), we get a palindrome (815707518).

The spelling of 212403306 in words is "two hundred twelve million, four hundred three thousand, three hundred six".