394026563 has 4 divisors (see below), whose sum is σ = 450316080. Its totient is φ = 337737048.

The previous prime is 394026557. The next prime is 394026601. The reversal of 394026563 is 365620493.

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 394026563 - 2¹² = 394022467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394026163) 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, 28144748 + ... + 28144761.

It is an arithmetic number, because the mean of its divisors is an integer number (112579020).

Almost surely, 2^394026563 is an apocalyptic number.

394026563 is a deficient number, since it is larger than the sum of its proper divisors (56289517).

394026563 is an equidigital number, since it uses as much as digits as its factorization.

394026563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56289516.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 394026563 is about 19850.1023423054. The cubic root of 394026563 is about 733.1201676343.

It can be divided in two parts, 3940 and 26563, that added together give a palindrome (30503).

The spelling of 394026563 in words is "three hundred ninety-four million, twenty-six thousand, five hundred sixty-three".