394289281 has 2 divisors, whose sum is σ = 394289282. Its totient is φ = 394289280.

The previous prime is 394289267. The next prime is 394289293. The reversal of 394289281 is 182982493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323460225 + 70829056 = 17985^2 + 8416^2 .

It is a cyclic number.

It is not a de Polignac number, because 394289281 - 2¹³ = 394281089 is a prime.

It is a super-2 number, since 2×394289281² = 310928074222993922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394280281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197144640 + 197144641.

It is an arithmetic number, because the mean of its divisors is an integer number (197144641).

Almost surely, 2^394289281 is an apocalyptic number.

It is an amenable number.

394289281 is a deficient number, since it is larger than the sum of its proper divisors (1).

394289281 is an equidigital number, since it uses as much as digits as its factorization.

394289281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 394289281 is about 19856.7187873526. The cubic root of 394289281 is about 733.2830678816.

The spelling of 394289281 in words is "three hundred ninety-four million, two hundred eighty-nine thousand, two hundred eighty-one".