212696639 has 4 divisors (see below), whose sum is σ = 225208224. Its totient is φ = 200185056.

The previous prime is 212696599. The next prime is 212696657. The reversal of 212696639 is 936696212.

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-212696639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212696639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212696689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6255767 + ... + 6255800.

It is an arithmetic number, because the mean of its divisors is an integer number (56302056).

Almost surely, 2^212696639 is an apocalyptic number.

212696639 is a deficient number, since it is larger than the sum of its proper divisors (12511585).

212696639 is a wasteful number, since it uses less digits than its factorization.

212696639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12511584.

The product of its digits is 209952, while the sum is 44.

The square root of 212696639 is about 14584.1228395814. The cubic root of 212696639 is about 596.9256061512.

The spelling of 212696639 in words is "two hundred twelve million, six hundred ninety-six thousand, six hundred thirty-nine".