396861629 has 4 divisors (see below), whose sum is σ = 400953084. Its totient is φ = 392770176.

The previous prime is 396861613. The next prime is 396861637. The reversal of 396861629 is 926168693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 926168693 = 53 ⋅17474881.

It can be written as a sum of positive squares in 2 ways, for example, as 197402500 + 199459129 = 14050^2 + 14123^2 .

It is a cyclic number.

It is not a de Polignac number, because 396861629 - 2⁴ = 396861613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396861029) 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 in 3 ways as a sum of consecutive naturals, for example, 2045582 + ... + 2045775.

It is an arithmetic number, because the mean of its divisors is an integer number (100238271).

Almost surely, 2^396861629 is an apocalyptic number.

It is an amenable number.

396861629 is a deficient number, since it is larger than the sum of its proper divisors (4091455).

396861629 is an equidigital number, since it uses as much as digits as its factorization.

396861629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091454.

The product of its digits is 839808, while the sum is 50.

The square root of 396861629 is about 19921.3862218471. The cubic root of 396861629 is about 734.8742617371.

The spelling of 396861629 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, six hundred twenty-nine".