689791 has 8 divisors (see below), whose sum is σ = 719264. Its totient is φ = 660960.

The previous prime is 689789. The next prime is 689797. The reversal of 689791 is 197986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689791 - 2¹ = 689789 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 (689797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3721 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (89908).

2⁶⁸⁹⁷⁹¹ is an apocalyptic number.

689791 is a deficient number, since it is larger than the sum of its proper divisors (29473).

689791 is a wasteful number, since it uses less digits than its factorization.

689791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 27216, while the sum is 40.

The square root of 689791 is about 830.5365735475. The cubic root of 689791 is about 88.3566363898.

The spelling of 689791 in words is "six hundred eighty-nine thousand, seven hundred ninety-one".