209457943 has 2 divisors, whose sum is σ = 209457944. Its totient is φ = 209457942.

The previous prime is 209457929. The next prime is 209457953. The reversal of 209457943 is 349754902.

209457943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209457943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209457943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209457953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104728971 + 104728972.

It is an arithmetic number, because the mean of its divisors is an integer number (104728972).

Almost surely, 2^209457943 is an apocalyptic number.

209457943 is a deficient number, since it is larger than the sum of its proper divisors (1).

209457943 is an equidigital number, since it uses as much as digits as its factorization.

209457943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 209457943 is about 14472.6619182513. The cubic root of 209457943 is about 593.8803348524.

The spelling of 209457943 in words is "two hundred nine million, four hundred fifty-seven thousand, nine hundred forty-three".