395447581 has 2 divisors, whose sum is σ = 395447582. Its totient is φ = 395447580.

The previous prime is 395447573. The next prime is 395447587. The reversal of 395447581 is 185744593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351225081 + 44222500 = 18741^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 395447581 - 2³ = 395447573 is a prime.

It is a super-2 number, since 2×395447581² = 312757578637503122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395447587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197723790 + 197723791.

It is an arithmetic number, because the mean of its divisors is an integer number (197723791).

Almost surely, 2^395447581 is an apocalyptic number.

It is an amenable number.

395447581 is a deficient number, since it is larger than the sum of its proper divisors (1).

395447581 is an equidigital number, since it uses as much as digits as its factorization.

395447581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 46.

The square root of 395447581 is about 19885.8638484729. The cubic root of 395447581 is about 734.0004188659. Note that the first 3 decimals are identical.

The spelling of 395447581 in words is "three hundred ninety-five million, four hundred forty-seven thousand, five hundred eighty-one".