205239967 has 2 divisors, whose sum is σ = 205239968. Its totient is φ = 205239966.

The previous prime is 205239907. The next prime is 205240037. The reversal of 205239967 is 769932502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205239967 is a prime.

It is a super-2 number, since 2×205239967² = 84246888108322178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205239907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102619983 + 102619984.

It is an arithmetic number, because the mean of its divisors is an integer number (102619984).

Almost surely, 2^205239967 is an apocalyptic number.

205239967 is a deficient number, since it is larger than the sum of its proper divisors (1).

205239967 is an equidigital number, since it uses as much as digits as its factorization.

205239967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 205239967 is about 14326.1986235009. The cubic root of 205239967 is about 589.8668348320.

The spelling of 205239967 in words is "two hundred five million, two hundred thirty-nine thousand, nine hundred sixty-seven".