396789643 has 4 divisors (see below), whose sum is σ = 396877320. Its totient is φ = 396701968.

The previous prime is 396789637. The next prime is 396789647. The reversal of 396789643 is 346987693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346987693 = 13 ⋅26691361.

It is a cyclic number.

It is not a de Polignac number, because 396789643 - 2⁹ = 396789131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396789647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36658 + ... + 46231.

It is an arithmetic number, because the mean of its divisors is an integer number (99219330).

Almost surely, 2^396789643 is an apocalyptic number.

396789643 is a deficient number, since it is larger than the sum of its proper divisors (87677).

396789643 is an equidigital number, since it uses as much as digits as its factorization.

396789643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87676.

The product of its digits is 5878656, while the sum is 55.

The square root of 396789643 is about 19919.5793881297. The cubic root of 396789643 is about 734.8298265540.

The spelling of 396789643 in words is "three hundred ninety-six million, seven hundred eighty-nine thousand, six hundred forty-three".