4000243439 has 2 divisors, whose sum is σ = 4000243440. Its totient is φ = 4000243438.

The previous prime is 4000243411. The next prime is 4000243459. The reversal of 4000243439 is 9343420004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000243439 is a prime.

It is a super-3 number, since 3×4000243439³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000243459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000121719 + 2000121720.

It is an arithmetic number, because the mean of its divisors is an integer number (2000121720).

Almost surely, 2^4000243439 is an apocalyptic number.

4000243439 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000243439 is an equidigital number, since it uses as much as digits as its factorization.

4000243439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 4000243439 is about 63247.4777283648. The cubic root of 4000243439 is about 1587.4332542587.

The spelling of 4000243439 in words is "four billion, two hundred forty-three thousand, four hundred thirty-nine".