394307081 has 4 divisors (see below), whose sum is σ = 450636672. Its totient is φ = 337977492.

The previous prime is 394307063. The next prime is 394307083. The reversal of 394307081 is 180703493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394307081 - 2¹⁰ = 394306057 is a prime.

It is a super-2 number, since 2×394307081² = 310956148253481122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394307083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28164785 + ... + 28164798.

It is an arithmetic number, because the mean of its divisors is an integer number (112659168).

Almost surely, 2^394307081 is an apocalyptic number.

It is an amenable number.

394307081 is a deficient number, since it is larger than the sum of its proper divisors (56329591).

394307081 is an equidigital number, since it uses as much as digits as its factorization.

394307081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56329590.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 394307081 is about 19857.1669933050. The cubic root of 394307081 is about 733.2941022861.

The spelling of 394307081 in words is "three hundred ninety-four million, three hundred seven thousand, eighty-one".