394772969 has 18 divisors (see below), whose sum is σ = 422778174. Its totient is φ = 368388160.

The previous prime is 394772947. The next prime is 394772971. The reversal of 394772969 is 969277493.

It can be written as a sum of positive squares in 3 ways, for example, as 7155625 + 387617344 = 2675^2 + 19688^2 .

It is not a de Polignac number, because 394772969 - 2²⁰ = 393724393 is a prime.

It is a super-2 number, since 2×394772969² = 311691394106149922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394772909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3689414 + ... + 3689520.

Almost surely, 2^394772969 is an apocalyptic number.

It is an amenable number.

394772969 is a deficient number, since it is larger than the sum of its proper divisors (28005205).

394772969 is an equidigital number, since it uses as much as digits as its factorization.

394772969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 177 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 56.

The square root of 394772969 is about 19868.8945087541. The cubic root of 394772969 is about 733.5827930695.

The spelling of 394772969 in words is "three hundred ninety-four million, seven hundred seventy-two thousand, nine hundred sixty-nine".