394975797841 has 9 divisors (see below), whose sum is σ = 397606918491. Its totient is φ = 392361986952.

The previous prime is 394975797829. The next prime is 394975797847. The reversal of 394975797841 is 148797579493.

The square root of 394975797841 is 628471.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 115773465025 + 279202332816 = 340255^2 + 528396^2 .

It is not a de Polignac number, because 394975797841 - 2⁵ = 394975797809 is a prime.

It is a super-2 number, since 2×394975797841² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394975797847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 98667946 + ... + 98671948.

It is an arithmetic number, because the mean of its divisors is an integer number (44178546499).

Almost surely, 2^394975797841 is an apocalyptic number.

394975797841 is the 628471-st square number.

394975797841 is the 314236-th centered octagonal number.

It is an amenable number.

394975797841 is a deficient number, since it is larger than the sum of its proper divisors (2631120650).

394975797841 is an frugal number, since it uses more digits than its factorization.

394975797841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320 (or 4160 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 73.

The spelling of 394975797841 in words is "three hundred ninety-four billion, nine hundred seventy-five million, seven hundred ninety-seven thousand, eight hundred forty-one".