394307811 has 16 divisors (see below), whose sum is σ = 584899200. Its totient is φ = 262539144.

The previous prime is 394307803. The next prime is 394307831. The reversal of 394307811 is 118703493.

It is a happy number.

It is not a de Polignac number, because 394307811 - 2³ = 394307803 is a prime.

It is a super-2 number, since 2×394307811² = 310957299631223442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394307831) 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 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 31158.

It is an arithmetic number, because the mean of its divisors is an integer number (36556200).

Almost surely, 2^394307811 is an apocalyptic number.

394307811 is a deficient number, since it is larger than the sum of its proper divisors (190591389).

394307811 is a wasteful number, since it uses less digits than its factorization.

394307811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18495 (or 18489 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 394307811 is about 19857.1853745691. The cubic root of 394307811 is about 733.2945548135.

The spelling of 394307811 in words is "three hundred ninety-four million, three hundred seven thousand, eight hundred eleven".