396844841 has 2 divisors, whose sum is σ = 396844842. Its totient is φ = 396844840.

The previous prime is 396844741. The next prime is 396844843. The reversal of 396844841 is 148448693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361798441 + 35046400 = 19021^2 + 5920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396844841 is a prime.

Together with 396844843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (396844843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198422420 + 198422421.

It is an arithmetic number, because the mean of its divisors is an integer number (198422421).

Almost surely, 2^396844841 is an apocalyptic number.

It is an amenable number.

396844841 is a deficient number, since it is larger than the sum of its proper divisors (1).

396844841 is an equidigital number, since it uses as much as digits as its factorization.

396844841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 47.

The square root of 396844841 is about 19920.9648611708. The cubic root of 396844841 is about 734.8638993990.

The spelling of 396844841 in words is "three hundred ninety-six million, eight hundred forty-four thousand, eight hundred forty-one".