212406679 has 4 divisors (see below), whose sum is σ = 221641776. Its totient is φ = 203171584.

The previous prime is 212406659. The next prime is 212406731. The reversal of 212406679 is 976604212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212406679 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212406659) 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 3 ways as a sum of consecutive naturals, for example, 4617514 + ... + 4617559.

It is an arithmetic number, because the mean of its divisors is an integer number (55410444).

Almost surely, 2^212406679 is an apocalyptic number.

212406679 is a deficient number, since it is larger than the sum of its proper divisors (9235097).

212406679 is an equidigital number, since it uses as much as digits as its factorization.

212406679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9235096.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 212406679 is about 14574.1785017201. The cubic root of 212406679 is about 596.6542286280.

The spelling of 212406679 in words is "two hundred twelve million, four hundred six thousand, six hundred seventy-nine".