394658398819 has 2 divisors, whose sum is σ = 394658398820. Its totient is φ = 394658398818.

The previous prime is 394658398781. The next prime is 394658398829. The reversal of 394658398819 is 918893856493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394658398819 - 2²⁵ = 394624844387 is a prime.

It is a super-2 number, since 2×394658398819² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394658398829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197329199409 + 197329199410.

It is an arithmetic number, because the mean of its divisors is an integer number (197329199410).

Almost surely, 2^394658398819 is an apocalyptic number.

394658398819 is a deficient number, since it is larger than the sum of its proper divisors (1).

394658398819 is an equidigital number, since it uses as much as digits as its factorization.

394658398819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403107840, while the sum is 73.

The spelling of 394658398819 in words is "three hundred ninety-four billion, six hundred fifty-eight million, three hundred ninety-eight thousand, eight hundred nineteen".