394891641 has 12 divisors (see below), whose sum is σ = 574892032. Its totient is φ = 261187416.

The previous prime is 394891621. The next prime is 394891643. The reversal of 394891641 is 146198493.

394891641 is a `hidden beast` number, since 3 + 9 + 489 + 164 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-394891641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394891643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171601 + ... + 173886.

Almost surely, 2^394891641 is an apocalyptic number.

It is an amenable number.

394891641 is a deficient number, since it is larger than the sum of its proper divisors (180000391).

394891641 is a wasteful number, since it uses less digits than its factorization.

394891641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345620 (or 345617 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 394891641 is about 19871.8806608735. The cubic root of 394891641 is about 733.6562927114.

The spelling of 394891641 in words is "three hundred ninety-four million, eight hundred ninety-one thousand, six hundred forty-one".