394228091 has 4 divisors (see below), whose sum is σ = 399218400. Its totient is φ = 389237784.

The previous prime is 394228069. The next prime is 394228111. The reversal of 394228091 is 190822493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394228091 - 2²⁶ = 327119227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394228031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495036 + ... + 2495193.

It is an arithmetic number, because the mean of its divisors is an integer number (99804600).

Almost surely, 2^394228091 is an apocalyptic number.

394228091 is a deficient number, since it is larger than the sum of its proper divisors (4990309).

394228091 is an equidigital number, since it uses as much as digits as its factorization.

394228091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990308.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 394228091 is about 19855.1779392681. The cubic root of 394228091 is about 733.2451330333.

The spelling of 394228091 in words is "three hundred ninety-four million, two hundred twenty-eight thousand, ninety-one".