396861877 has 2 divisors, whose sum is σ = 396861878. Its totient is φ = 396861876.

The previous prime is 396861863. The next prime is 396861961. The reversal of 396861877 is 778168693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387656721 + 9205156 = 19689^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 396861877 - 2¹¹ = 396859829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396861977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198430938 + 198430939.

It is an arithmetic number, because the mean of its divisors is an integer number (198430939).

Almost surely, 2^396861877 is an apocalyptic number.

It is an amenable number.

396861877 is a deficient number, since it is larger than the sum of its proper divisors (1).

396861877 is an equidigital number, since it uses as much as digits as its factorization.

396861877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 396861877 is about 19921.3924463126. The cubic root of 396861877 is about 734.8744148120.

The spelling of 396861877 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, eight hundred seventy-seven".