395878981 has 2 divisors, whose sum is σ = 395878982. Its totient is φ = 395878980.

The previous prime is 395878943. The next prime is 395879009. The reversal of 395878981 is 189878593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394657956 + 1221025 = 19866^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395878981 is a prime.

It is a super-2 number, since 2×395878981² = 313440335195196722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395878381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197939490 + 197939491.

It is an arithmetic number, because the mean of its divisors is an integer number (197939491).

Almost surely, 2^395878981 is an apocalyptic number.

It is an amenable number.

395878981 is a deficient number, since it is larger than the sum of its proper divisors (1).

395878981 is an equidigital number, since it uses as much as digits as its factorization.

395878981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 58.

The square root of 395878981 is about 19896.7077929993. The cubic root of 395878981 is about 734.2672327416.

The spelling of 395878981 in words is "three hundred ninety-five million, eight hundred seventy-eight thousand, nine hundred eighty-one".