494439721 has 2 divisors, whose sum is σ = 494439722. Its totient is φ = 494439720.

The previous prime is 494439667. The next prime is 494439727. The reversal of 494439721 is 127934494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 494439696 + 25 = 22236^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 494439721 - 2⁷ = 494439593 is a prime.

It is not a weakly prime, because it can be changed into another prime (494439727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247219860 + 247219861.

It is an arithmetic number, because the mean of its divisors is an integer number (247219861).

Almost surely, 2^494439721 is an apocalyptic number.

It is an amenable number.

494439721 is a deficient number, since it is larger than the sum of its proper divisors (1).

494439721 is an equidigital number, since it uses as much as digits as its factorization.

494439721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 494439721 is about 22236.0005621515. Note that the first 3 decimals coincide. The cubic root of 494439721 is about 790.7474211449.

The spelling of 494439721 in words is "four hundred ninety-four million, four hundred thirty-nine thousand, seven hundred twenty-one".