394204643 has 4 divisors (see below), whose sum is σ = 450519600. Its totient is φ = 337889688.

The previous prime is 394204633. The next prime is 394204729. The reversal of 394204643 is 346402493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346402493 = 103 ⋅3363131.

It is a cyclic number.

It is not a de Polignac number, because 394204643 - 2¹⁴ = 394188259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394204633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28157468 + ... + 28157481.

It is an arithmetic number, because the mean of its divisors is an integer number (112629900).

Almost surely, 2^394204643 is an apocalyptic number.

394204643 is a deficient number, since it is larger than the sum of its proper divisors (56314957).

394204643 is an equidigital number, since it uses as much as digits as its factorization.

394204643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56314956.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 394204643 is about 19854.5874547924. The cubic root of 394204643 is about 733.2305953640.

The spelling of 394204643 in words is "three hundred ninety-four million, two hundred four thousand, six hundred forty-three".