394636019 has 2 divisors, whose sum is σ = 394636020. Its totient is φ = 394636018.

The previous prime is 394636013. The next prime is 394636027. The reversal of 394636019 is 910636493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394636019 - 2⁴ = 394636003 is a prime.

It is a super-2 number, since 2×394636019² = 311475174984336722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394636013) 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 as a sum of consecutive naturals, namely, 197318009 + 197318010.

It is an arithmetic number, because the mean of its divisors is an integer number (197318010).

Almost surely, 2^394636019 is an apocalyptic number.

394636019 is a deficient number, since it is larger than the sum of its proper divisors (1).

394636019 is an equidigital number, since it uses as much as digits as its factorization.

394636019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 394636019 is about 19865.4478680950. The cubic root of 394636019 is about 733.4979546173.

The spelling of 394636019 in words is "three hundred ninety-four million, six hundred thirty-six thousand, nineteen".