396646 has 4 divisors (see below), whose sum is σ = 594972. Its totient is φ = 198322.

The previous prime is 396637. The next prime is 396647. The reversal of 396646 is 646693.

396646 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646693 = 41 ⋅15773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99160 + ... + 99163.

It is an arithmetic number, because the mean of its divisors is an integer number (148743).

2³⁹⁶⁶⁴⁶ is an apocalyptic number.

396646 is a deficient number, since it is larger than the sum of its proper divisors (198326).

396646 is a wasteful number, since it uses less digits than its factorization.

396646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198325.

The product of its digits is 23328, while the sum is 34.

The square root of 396646 is about 629.7983804362. The cubic root of 396646 is about 73.4741143207.

Subtracting 396646 from its reverse (646693), we obtain a cube (250047 = 63³).

The spelling of 396646 in words is "three hundred ninety-six thousand, six hundred forty-six".