394971089 has 2 divisors, whose sum is σ = 394971090. Its totient is φ = 394971088.

The previous prime is 394971079. The next prime is 394971119. The reversal of 394971089 is 980179493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327320464 + 67650625 = 18092^2 + 8225^2 .

It is a cyclic number.

It is not a de Polignac number, because 394971089 - 2²⁰ = 393922513 is a prime.

It is a super-2 number, since 2×394971089² = 312004322291691842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394971079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197485544 + 197485545.

It is an arithmetic number, because the mean of its divisors is an integer number (197485545).

Almost surely, 2^394971089 is an apocalyptic number.

It is an amenable number.

394971089 is a deficient number, since it is larger than the sum of its proper divisors (1).

394971089 is an equidigital number, since it uses as much as digits as its factorization.

394971089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 394971089 is about 19873.8795659026. The cubic root of 394971089 is about 733.7054906943.

The spelling of 394971089 in words is "three hundred ninety-four million, nine hundred seventy-one thousand, eighty-nine".