394377720019 has 2 divisors, whose sum is σ = 394377720020. Its totient is φ = 394377720018.

The previous prime is 394377720017. The next prime is 394377720031. The reversal of 394377720019 is 910027773493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394377720019 - 2¹ = 394377720017 is a prime.

It is a super-2 number, since 2×394377720019² (a number of 24 digits) contains 22 as substring.

Together with 394377720017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394377720013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197188860009 + 197188860010.

It is an arithmetic number, because the mean of its divisors is an integer number (197188860010).

Almost surely, 2^394377720019 is an apocalyptic number.

394377720019 is a deficient number, since it is larger than the sum of its proper divisors (1).

394377720019 is an equidigital number, since it uses as much as digits as its factorization.

394377720019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 52.

The spelling of 394377720019 in words is "three hundred ninety-four billion, three hundred seventy-seven million, seven hundred twenty thousand, nineteen".