494021947 has 4 divisors (see below), whose sum is σ = 494066736. Its totient is φ = 493977160.

The previous prime is 494021939. The next prime is 494021959. The reversal of 494021947 is 749120494.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 749120494 = 2 ⋅374560247.

It is a cyclic number.

It is not a de Polignac number, because 494021947 - 2³ = 494021939 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494021917) 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, 7098 + ... + 32224.

It is an arithmetic number, because the mean of its divisors is an integer number (123516684).

Almost surely, 2^494021947 is an apocalyptic number.

494021947 is a deficient number, since it is larger than the sum of its proper divisors (44789).

494021947 is a wasteful number, since it uses less digits than its factorization.

494021947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44788.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 494021947 is about 22226.6044865157. The cubic root of 494021947 is about 790.5246458929.

The spelling of 494021947 in words is "four hundred ninety-four million, twenty-one thousand, nine hundred forty-seven".