394371623929 has 4 divisors (see below), whose sum is σ = 400836732580. Its totient is φ = 387906515280.

The previous prime is 394371623927. The next prime is 394371623951. The reversal of 394371623929 is 929326173493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 929326173493 = 18119 ⋅51290147.

It can be written as a sum of positive squares in 2 ways, for example, as 184105355625 + 210266268304 = 429075^2 + 458548^2 .

It is a cyclic number.

It is not a de Polignac number, because 394371623929 - 2¹ = 394371623927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394371623927) 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 in 3 ways as a sum of consecutive naturals, for example, 3232554234 + ... + 3232554355.

It is an arithmetic number, because the mean of its divisors is an integer number (100209183145).

Almost surely, 2^394371623929 is an apocalyptic number.

It is an amenable number.

394371623929 is a deficient number, since it is larger than the sum of its proper divisors (6465108651).

394371623929 is an equidigital number, since it uses as much as digits as its factorization.

394371623929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465108650.

The product of its digits is 13226976, while the sum is 58.

The spelling of 394371623929 in words is "three hundred ninety-four billion, three hundred seventy-one million, six hundred twenty-three thousand, nine hundred twenty-nine".