212306389 has 2 divisors, whose sum is σ = 212306390. Its totient is φ = 212306388.

The previous prime is 212306377. The next prime is 212306431. The reversal of 212306389 is 983603212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212197489 + 108900 = 14567^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 212306389 - 2⁵ = 212306357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212306089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106153194 + 106153195.

It is an arithmetic number, because the mean of its divisors is an integer number (106153195).

Almost surely, 2^212306389 is an apocalyptic number.

It is an amenable number.

212306389 is a deficient number, since it is larger than the sum of its proper divisors (1).

212306389 is an equidigital number, since it uses as much as digits as its factorization.

212306389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 212306389 is about 14570.7374212838. The cubic root of 212306389 is about 596.5603083660.

The spelling of 212306389 in words is "two hundred twelve million, three hundred six thousand, three hundred eighty-nine".