394508090 has 16 divisors (see below), whose sum is σ = 710346888. Its totient is φ = 157751616.

The previous prime is 394508087. The next prime is 394508099. The reversal of 394508090 is 90805493.

It can be written as a sum of positive squares in 4 ways, for example, as 304048969 + 90459121 = 17437^2 + 9511^2 .

It is not an unprimeable number, because it can be changed into a prime (394508099) 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 7 ways as a sum of consecutive naturals, for example, 45764 + ... + 53696.

Almost surely, 2^394508090 is an apocalyptic number.

394508090 is a deficient number, since it is larger than the sum of its proper divisors (315838798).

394508090 is a wasteful number, since it uses less digits than its factorization.

394508090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12913.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 394508090 is about 19862.2277199714. The cubic root of 394508090 is about 733.4186868054.

The spelling of 394508090 in words is "three hundred ninety-four million, five hundred eight thousand, ninety".