395665213 has 2 divisors, whose sum is σ = 395665214. Its totient is φ = 395665212.

The previous prime is 395665201. The next prime is 395665229. The reversal of 395665213 is 312566593.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220314649 + 175350564 = 14843^2 + 13242^2 .

It is a cyclic number.

It is not a de Polignac number, because 395665213 - 2⁵ = 395665181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395665243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197832606 + 197832607.

It is an arithmetic number, because the mean of its divisors is an integer number (197832607).

Almost surely, 2^395665213 is an apocalyptic number.

It is an amenable number.

395665213 is a deficient number, since it is larger than the sum of its proper divisors (1).

395665213 is an equidigital number, since it uses as much as digits as its factorization.

395665213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 40.

The square root of 395665213 is about 19891.3351236160. The cubic root of 395665213 is about 734.1350449550.

It can be divided in two parts, 3956 and 65213, that added together give a square (69169 = 263²).

The spelling of 395665213 in words is "three hundred ninety-five million, six hundred sixty-five thousand, two hundred thirteen".