789643 has 4 divisors (see below), whose sum is σ = 793408. Its totient is φ = 785880.

The previous prime is 789631. The next prime is 789653. The reversal of 789643 is 346987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346987 = 17 ⋅20411.

It is a cyclic number.

It is not a de Polignac number, because 789643 - 2⁵ = 789611 is a prime.

It is a Duffinian number.

789643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (789623) 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, 1548 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (198352).

2⁷⁸⁹⁶⁴³ is an apocalyptic number.

789643 is a deficient number, since it is larger than the sum of its proper divisors (3765).

789643 is a wasteful number, since it uses less digits than its factorization.

789643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764.

The product of its digits is 36288, while the sum is 37.

The square root of 789643 is about 888.6185908476. The cubic root of 789643 is about 92.4294275440.

The spelling of 789643 in words is "seven hundred eighty-nine thousand, six hundred forty-three".