243439967 has 2 divisors, whose sum is σ = 243439968. Its totient is φ = 243439966.

The previous prime is 243439943. The next prime is 243439969. The reversal of 243439967 is 769934342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243439967 is a prime.

It is a super-2 number, since 2×243439967² = 118526035065922178, which contains 22 as substring.

Together with 243439969, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243439969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121719983 + 121719984.

It is an arithmetic number, because the mean of its divisors is an integer number (121719984).

Almost surely, 2^243439967 is an apocalyptic number.

243439967 is a deficient number, since it is larger than the sum of its proper divisors (1).

243439967 is an equidigital number, since it uses as much as digits as its factorization.

243439967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 47.

The square root of 243439967 is about 15602.5628343551. The cubic root of 243439967 is about 624.4015322945.

The spelling of 243439967 in words is "two hundred forty-three million, four hundred thirty-nine thousand, nine hundred sixty-seven".