395990797 has 2 divisors, whose sum is σ = 395990798. Its totient is φ = 395990796.

The previous prime is 395990779. The next prime is 395990879. The reversal of 395990797 is 797099593.

Together with previous prime (395990779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392872041 + 3118756 = 19821^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 395990797 - 2¹⁵ = 395958029 is a prime.

It is a super-2 number, since 2×395990797² = 313617422617390418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395990767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197995398 + 197995399.

It is an arithmetic number, because the mean of its divisors is an integer number (197995399).

Almost surely, 2^395990797 is an apocalyptic number.

It is an amenable number.

395990797 is a deficient number, since it is larger than the sum of its proper divisors (1).

395990797 is an equidigital number, since it uses as much as digits as its factorization.

395990797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4822335, while the sum is 58.

The square root of 395990797 is about 19899.5175067136. The cubic root of 395990797 is about 734.3363574826.

The spelling of 395990797 in words is "three hundred ninety-five million, nine hundred ninety thousand, seven hundred ninety-seven".