3997979 has 2 divisors, whose sum is σ = 3997980. Its totient is φ = 3997978.

The previous prime is 3997967. The next prime is 3997993. The reversal of 3997979 is 9797993.

It is a weak prime.

It is an emirp because it is prime and its reverse (9797993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3997979 - 2⁴ = 3997963 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3997979.

It is not a weakly prime, because it can be changed into another prime (3997909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998989 + 1998990.

It is an arithmetic number, because the mean of its divisors is an integer number (1998990).

Almost surely, 2^3997979 is an apocalyptic number.

3997979 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997979 is an equidigital number, since it uses as much as digits as its factorization.

3997979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 964467, while the sum is 53.

The square root of 3997979 is about 1999.4946861645. The cubic root of 3997979 is about 158.7133662136.

The spelling of 3997979 in words is "three million, nine hundred ninety-seven thousand, nine hundred seventy-nine".