396861637 has 2 divisors, whose sum is σ = 396861638. Its totient is φ = 396861636.

The previous prime is 396861613. The next prime is 396861643. The reversal of 396861637 is 736168693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234273636 + 162588001 = 15306^2 + 12751^2 .

It is a cyclic number.

It is not a de Polignac number, because 396861637 - 2¹⁹ = 396337349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396861337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198430818 + 198430819.

It is an arithmetic number, because the mean of its divisors is an integer number (198430819).

Almost surely, 2^396861637 is an apocalyptic number.

It is an amenable number.

396861637 is a deficient number, since it is larger than the sum of its proper divisors (1).

396861637 is an equidigital number, since it uses as much as digits as its factorization.

396861637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 396861637 is about 19921.3864226364. The cubic root of 396861637 is about 734.8742666750.

The spelling of 396861637 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, six hundred thirty-seven".