395304021 has 18 divisors (see below), whose sum is σ = 664219062. Its totient is φ = 225887760.

The previous prime is 395303977. The next prime is 395304023. The reversal of 395304021 is 120403593.

It can be written as a sum of positive squares in only one way, i.e., 384708996 + 10595025 = 19614^2 + 3255^2 .

It is not a de Polignac number, because 395304021 - 2¹⁷ = 395172949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395304023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 447750 + ... + 448631.

It is an arithmetic number, because the mean of its divisors is an integer number (36901059).

Almost surely, 2^395304021 is an apocalyptic number.

It is an amenable number.

395304021 is a deficient number, since it is larger than the sum of its proper divisors (268915041).

395304021 is a wasteful number, since it uses less digits than its factorization.

395304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896401 (or 896391 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 395304021 is about 19882.2539215251. The cubic root of 395304021 is about 733.9115863135.

The spelling of 395304021 in words is "three hundred ninety-five million, three hundred four thousand, twenty-one".