3999870439 has 2 divisors, whose sum is σ = 3999870440. Its totient is φ = 3999870438.

The previous prime is 3999870437. The next prime is 3999870451. The reversal of 3999870439 is 9340789993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3999870439 - 2¹ = 3999870437 is a prime.

Together with 3999870437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999870437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999935219 + 1999935220.

It is an arithmetic number, because the mean of its divisors is an integer number (1999935220).

Almost surely, 2^3999870439 is an apocalyptic number.

3999870439 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999870439 is an equidigital number, since it uses as much as digits as its factorization.

3999870439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The square root of 3999870439 is about 63244.5289254335. The cubic root of 3999870439 is about 1587.3839130108.

The spelling of 3999870439 in words is "three billion, nine hundred ninety-nine million, eight hundred seventy thousand, four hundred thirty-nine".