395844821 has 4 divisors (see below), whose sum is σ = 397422144. Its totient is φ = 394267500.

The previous prime is 395844817. The next prime is 395844851. The reversal of 395844821 is 128448593.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 395844821 - 2² = 395844817 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 (395844851) 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, 788285 + ... + 788786.

It is an arithmetic number, because the mean of its divisors is an integer number (99355536).

Almost surely, 2^395844821 is an apocalyptic number.

It is an amenable number.

395844821 is a deficient number, since it is larger than the sum of its proper divisors (1577323).

395844821 is a wasteful number, since it uses less digits than its factorization.

395844821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577322.

The product of its digits is 276480, while the sum is 44.

The square root of 395844821 is about 19895.8493410058. The cubic root of 395844821 is about 734.2461124065.

The spelling of 395844821 in words is "three hundred ninety-five million, eight hundred forty-four thousand, eight hundred twenty-one".