395423644808644 has 27 divisors (see below), whose sum is σ = 692718121362253. Its totient is φ = 197504399236400.

The previous prime is 395423644808603. The next prime is 395423644808707. The reversal of 395423644808644 is 446808446324593.

The square root of 395423644808644 is 19885262.

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., 260398315207044 + 135025329601600 = 16136862^2 + 11620040^2 .

It is a super-2 number, since 2×395423644808644² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42196521279 + ... + 42196530649.

Almost surely, 2^{395423644808644} is an apocalyptic number.

395423644808644 is the 19885262-nd square number.

It is an amenable number.

395423644808644 is a deficient number, since it is larger than the sum of its proper divisors (297294476553609).

395423644808644 is an frugal number, since it uses more digits than its factorization.

395423644808644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20868 (or 10434 counting only the distinct ones).

The product of its (nonzero) digits is 1911029760, while the sum is 70.

The spelling of 395423644808644 in words is "three hundred ninety-five trillion, four hundred twenty-three billion, six hundred forty-four million, eight hundred eight thousand, six hundred forty-four".