394944281 has 2 divisors, whose sum is σ = 394944282. Its totient is φ = 394944280.

The previous prime is 394944269. The next prime is 394944283. The reversal of 394944281 is 182449493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360240400 + 34703881 = 18980^2 + 5891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394944281 is a prime.

It is a super-2 number, since 2×394944281² = 311961970189213922, which contains 22 as substring.

Together with 394944283, 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 (394944283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197472140 + 197472141.

It is an arithmetic number, because the mean of its divisors is an integer number (197472141).

Almost surely, 2^394944281 is an apocalyptic number.

It is an amenable number.

394944281 is a deficient number, since it is larger than the sum of its proper divisors (1).

394944281 is an equidigital number, since it uses as much as digits as its factorization.

394944281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 394944281 is about 19873.2051013419. The cubic root of 394944281 is about 733.6888906423.

The spelling of 394944281 in words is "three hundred ninety-four million, nine hundred forty-four thousand, two hundred eighty-one".