394229745871 has 4 divisors (see below), whose sum is σ = 424555110952. Its totient is φ = 363904380792.

The previous prime is 394229745839. The next prime is 394229745881. The reversal of 394229745871 is 178547922493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394229745871 - 2⁵ = 394229745839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394229745881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15162682521 + ... + 15162682546.

It is an arithmetic number, because the mean of its divisors is an integer number (106138777738).

Almost surely, 2^394229745871 is an apocalyptic number.

394229745871 is a deficient number, since it is larger than the sum of its proper divisors (30325365081).

394229745871 is a wasteful number, since it uses less digits than its factorization.

394229745871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30325365080.

The product of its digits is 30481920, while the sum is 61.

The spelling of 394229745871 in words is "three hundred ninety-four billion, two hundred twenty-nine million, seven hundred forty-five thousand, eight hundred seventy-one".