3978979 has 2 divisors, whose sum is σ = 3978980. Its totient is φ = 3978978.

The previous prime is 3978971. The next prime is 3979013. The reversal of 3978979 is 9798793.

It is a weak prime.

It is an emirp because it is prime and its reverse (9798793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3978979 - 2³ = 3978971 is a prime.

It is not a weakly prime, because it can be changed into another prime (3978971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989489 + 1989490.

It is an arithmetic number, because the mean of its divisors is an integer number (1989490).

Almost surely, 2^3978979 is an apocalyptic number.

3978979 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978979 is an equidigital number, since it uses as much as digits as its factorization.

3978979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 3978979 is about 1994.7378273848. The cubic root of 3978979 is about 158.4615436760.

The spelling of 3978979 in words is "three million, nine hundred seventy-eight thousand, nine hundred seventy-nine".