395989942247 has 4 divisors (see below), whose sum is σ = 396352239720. Its totient is φ = 395627644776.

The previous prime is 395989942219. The next prime is 395989942273. The reversal of 395989942247 is 742249989593.

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 395989942247 - 2²² = 395985747943 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 (395989941247) 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, 181147097 + ... + 181149282.

It is an arithmetic number, because the mean of its divisors is an integer number (99088059930).

Almost surely, 2^395989942247 is an apocalyptic number.

395989942247 is a deficient number, since it is larger than the sum of its proper divisors (362297473).

395989942247 is a wasteful number, since it uses less digits than its factorization.

395989942247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362297472.

The product of its digits is 352719360, while the sum is 71.

The spelling of 395989942247 in words is "three hundred ninety-five billion, nine hundred eighty-nine million, nine hundred forty-two thousand, two hundred forty-seven".