3971599 has 2 divisors, whose sum is σ = 3971600. Its totient is φ = 3971598.

The previous prime is 3971587. The next prime is 3971621. The reversal of 3971599 is 9951793.

It is a weak prime.

It is an emirp because it is prime and its reverse (9951793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3971599 - 2⁹ = 3971087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3971549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985799 + 1985800.

It is an arithmetic number, because the mean of its divisors is an integer number (1985800).

Almost surely, 2^3971599 is an apocalyptic number.

3971599 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971599 is an equidigital number, since it uses as much as digits as its factorization.

3971599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 43.

The square root of 3971599 is about 1992.8871016693. The cubic root of 3971599 is about 158.3635143451.

Adding to 3971599 its product of digits (76545), we get a square (4048144 = 2012²).

The spelling of 3971599 in words is "three million, nine hundred seventy-one thousand, five hundred ninety-nine".