212809739 has 2 divisors, whose sum is σ = 212809740. Its totient is φ = 212809738.

The previous prime is 212809733. The next prime is 212809781. The reversal of 212809739 is 937908212.

It is a happy number.

212809739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212809739 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212809696 and 212809705.

It is not a weakly prime, because it can be changed into another prime (212809733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106404869 + 106404870.

It is an arithmetic number, because the mean of its divisors is an integer number (106404870).

Almost surely, 2^212809739 is an apocalyptic number.

212809739 is a deficient number, since it is larger than the sum of its proper divisors (1).

212809739 is an equidigital number, since it uses as much as digits as its factorization.

212809739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 212809739 is about 14587.9998286263. Note that the first 3 decimals coincide. The cubic root of 212809739 is about 597.0313911219.

The spelling of 212809739 in words is "two hundred twelve million, eight hundred nine thousand, seven hundred thirty-nine".