394891811 has 4 divisors (see below), whose sum is σ = 408508800. Its totient is φ = 381274824.

The previous prime is 394891799. The next prime is 394891823. The reversal of 394891811 is 118198493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118198493 = 7 ⋅16885499.

It is an interprime number because it is at equal distance from previous prime (394891799) and next prime (394891823).

It is a cyclic number.

It is not a de Polignac number, because 394891811 - 2¹⁸ = 394629667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394891831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6808451 + ... + 6808508.

It is an arithmetic number, because the mean of its divisors is an integer number (102127200).

Almost surely, 2^394891811 is an apocalyptic number.

394891811 is a deficient number, since it is larger than the sum of its proper divisors (13616989).

394891811 is a wasteful number, since it uses less digits than its factorization.

394891811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13616988.

The product of its digits is 62208, while the sum is 44.

The square root of 394891811 is about 19871.8849382740. The cubic root of 394891811 is about 733.6563979905.

It can be divided in two parts, 3948 and 91811, that added together give a palindrome (95759).

The spelling of 394891811 in words is "three hundred ninety-four million, eight hundred ninety-one thousand, eight hundred eleven".