3999689737 has 2 divisors, whose sum is σ = 3999689738. Its totient is φ = 3999689736.

The previous prime is 3999689711. The next prime is 3999689761. The reversal of 3999689737 is 7379869993.

3999689737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2526972361 + 1472717376 = 50269^2 + 38376^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999689737 - 2²³ = 3991301129 is a prime.

It is not a weakly prime, because it can be changed into another prime (3999689797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999844868 + 1999844869.

It is an arithmetic number, because the mean of its divisors is an integer number (1999844869).

Almost surely, 2^3999689737 is an apocalyptic number.

It is an amenable number.

3999689737 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999689737 is an equidigital number, since it uses as much as digits as its factorization.

3999689737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138883248, while the sum is 70.

The square root of 3999689737 is about 63243.1003114174. The cubic root of 3999689737 is about 1587.3600082559.

The spelling of 3999689737 in words is "three billion, nine hundred ninety-nine million, six hundred eighty-nine thousand, seven hundred thirty-seven".