788639 has 4 divisors (see below), whose sum is σ = 792960. Its totient is φ = 784320.

The previous prime is 788621. The next prime is 788651. The reversal of 788639 is 936887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 788639 - 2⁸ = 788383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 788596 and 788605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (788659) 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, 1874 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (198240).

2⁷⁸⁸⁶³⁹ is an apocalyptic number.

788639 is a deficient number, since it is larger than the sum of its proper divisors (4321).

788639 is a wasteful number, since it uses less digits than its factorization.

788639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4320.

The product of its digits is 72576, while the sum is 41.

The square root of 788639 is about 888.0534893800. The cubic root of 788639 is about 92.3902374699.

The spelling of 788639 in words is "seven hundred eighty-eight thousand, six hundred thirty-nine".