394972771 has 2 divisors, whose sum is σ = 394972772. Its totient is φ = 394972770.

The previous prime is 394972769. The next prime is 394972789. The reversal of 394972771 is 177279493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394972771 - 2¹ = 394972769 is a prime.

Together with 394972769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394972871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197486385 + 197486386.

It is an arithmetic number, because the mean of its divisors is an integer number (197486386).

Almost surely, 2^394972771 is an apocalyptic number.

394972771 is a deficient number, since it is larger than the sum of its proper divisors (1).

394972771 is an equidigital number, since it uses as much as digits as its factorization.

394972771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 49.

The square root of 394972771 is about 19873.9218827085. The cubic root of 394972771 is about 733.7065321974.

The spelling of 394972771 in words is "three hundred ninety-four million, nine hundred seventy-two thousand, seven hundred seventy-one".