3997723837 has 2 divisors, whose sum is σ = 3997723838. Its totient is φ = 3997723836.

The previous prime is 3997723753. The next prime is 3997723853. The reversal of 3997723837 is 7383277993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2059435161 + 1938288676 = 45381^2 + 44026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3997723837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3997723337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998861918 + 1998861919.

It is an arithmetic number, because the mean of its divisors is an integer number (1998861919).

Almost surely, 2^3997723837 is an apocalyptic number.

It is an amenable number.

3997723837 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997723837 is an equidigital number, since it uses as much as digits as its factorization.

3997723837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256, while the sum is 58.

The square root of 3997723837 is about 63227.5559942024. Note that the first 3 decimals coincide. The cubic root of 3997723837 is about 1587.0998962093.

The spelling of 3997723837 in words is "three billion, nine hundred ninety-seven million, seven hundred twenty-three thousand, eight hundred thirty-seven".