394080845 has 4 divisors (see below), whose sum is σ = 472897020. Its totient is φ = 315264672.

The previous prime is 394080809. The next prime is 394080847. The reversal of 394080845 is 548080493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548080493 = 17 ⋅32240029.

It can be written as a sum of positive squares in 2 ways, for example, as 73599241 + 320481604 = 8579^2 + 17902^2 .

It is a cyclic number.

It is not a de Polignac number, because 394080845 - 2¹⁶ = 394015309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394080847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39408080 + ... + 39408089.

It is an arithmetic number, because the mean of its divisors is an integer number (118224255).

Almost surely, 2^394080845 is an apocalyptic number.

It is an amenable number.

394080845 is a deficient number, since it is larger than the sum of its proper divisors (78816175).

394080845 is an equidigital number, since it uses as much as digits as its factorization.

394080845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78816174.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 394080845 is about 19851.4695929546. The cubic root of 394080845 is about 733.1538315251.

The spelling of 394080845 in words is "three hundred ninety-four million, eighty thousand, eight hundred forty-five".