395959821 has 8 divisors (see below), whose sum is σ = 528119040. Its totient is φ = 263886912.

The previous prime is 395959799. The next prime is 395959849. The reversal of 395959821 is 128959593.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 395959821 - 2⁶ = 395959757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395959721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9981 + ... + 29858.

It is an arithmetic number, because the mean of its divisors is an integer number (66014880).

Almost surely, 2^395959821 is an apocalyptic number.

It is an amenable number.

395959821 is a deficient number, since it is larger than the sum of its proper divisors (132159219).

395959821 is a wasteful number, since it uses less digits than its factorization.

395959821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43155.

The product of its digits is 874800, while the sum is 51.

The square root of 395959821 is about 19898.7391811642. The cubic root of 395959821 is about 734.3172093977.

The spelling of 395959821 in words is "three hundred ninety-five million, nine hundred fifty-nine thousand, eight hundred twenty-one".