3999870437 has 2 divisors, whose sum is σ = 3999870438. Its totient is φ = 3999870436.

The previous prime is 3999870419. The next prime is 3999870439. The reversal of 3999870437 is 7340789993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2690081956 + 1309788481 = 51866^2 + 36191^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999870437 - 2¹² = 3999866341 is a prime.

Together with 3999870439, 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 (3999870439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999935218 + 1999935219.

It is an arithmetic number, because the mean of its divisors is an integer number (1999935219).

Almost surely, 2^3999870437 is an apocalyptic number.

It is an amenable number.

3999870437 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999870437 is an equidigital number, since it uses as much as digits as its factorization.

3999870437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The square root of 3999870437 is about 63244.5289096219. The cubic root of 3999870437 is about 1587.3839127463.

The spelling of 3999870437 in words is "three billion, nine hundred ninety-nine million, eight hundred seventy thousand, four hundred thirty-seven".