212306430 has 32 divisors (see below), whose sum is σ = 582326784. Its totient is φ = 48527136.

The previous prime is 212306389. The next prime is 212306431. The reversal of 212306430 is 34603212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212306397 and 212306406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212306431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505282 + ... + 505701.

It is an arithmetic number, because the mean of its divisors is an integer number (18197712).

Almost surely, 2^212306430 is an apocalyptic number.

212306430 is an abundant number, since it is smaller than the sum of its proper divisors (370020354).

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

212306430 is a wasteful number, since it uses less digits than its factorization.

212306430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011000.

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

The square root of 212306430 is about 14570.7388282132. The cubic root of 212306430 is about 596.5603467680.

Adding to 212306430 its reverse (34603212), we get a palindrome (246909642).

The spelling of 212306430 in words is "two hundred twelve million, three hundred six thousand, four hundred thirty".