3978217 has 2 divisors, whose sum is σ = 3978218. Its totient is φ = 3978216.

The previous prime is 3978197. The next prime is 3978229. The reversal of 3978217 is 7128793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 1478656 = 1581^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978217 - 2¹¹ = 3976169 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3978257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989108 + 1989109.

It is an arithmetic number, because the mean of its divisors is an integer number (1989109).

Almost surely, 2^3978217 is an apocalyptic number.

It is an amenable number.

3978217 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978217 is an equidigital number, since it uses as much as digits as its factorization.

3978217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 3978217 is about 1994.5468156952. The cubic root of 3978217 is about 158.4514275629.

The spelling of 3978217 in words is "three million, nine hundred seventy-eight thousand, two hundred seventeen".