394333721 has 2 divisors, whose sum is σ = 394333722. Its totient is φ = 394333720.

The previous prime is 394333697. The next prime is 394333729. The reversal of 394333721 is 127333493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262083721 + 132250000 = 16189^2 + 11500^2 .

It is a cyclic number.

It is not a de Polignac number, because 394333721 - 2¹⁴ = 394317337 is a prime.

It is not a weakly prime, because it can be changed into another prime (394333729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197166860 + 197166861.

It is an arithmetic number, because the mean of its divisors is an integer number (197166861).

Almost surely, 2^394333721 is an apocalyptic number.

It is an amenable number.

394333721 is a deficient number, since it is larger than the sum of its proper divisors (1).

394333721 is an equidigital number, since it uses as much as digits as its factorization.

394333721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 35.

The square root of 394333721 is about 19857.8377725270. The cubic root of 394333721 is about 733.3106160777.

The spelling of 394333721 in words is "three hundred ninety-four million, three hundred thirty-three thousand, seven hundred twenty-one".