395721 has 6 divisors (see below), whose sum is σ = 571610. Its totient is φ = 263808.

The previous prime is 395719. The next prime is 395737. The reversal of 395721 is 127593.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 35721 = 600^2 + 189^2 .

It is not a de Polignac number, because 395721 - 2¹ = 395719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21976 + ... + 21993.

2³⁹⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

395721 is a deficient number, since it is larger than the sum of its proper divisors (175889).

395721 is a wasteful number, since it uses less digits than its factorization.

395721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43975 (or 43972 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 395721 is about 629.0635897904. The cubic root of 395721 is about 73.4169546570.

The spelling of 395721 in words is "three hundred ninety-five thousand, seven hundred twenty-one".