689749 has 4 divisors (see below), whose sum is σ = 698560. Its totient is φ = 680940.

The previous prime is 689723. The next prime is 689761. The reversal of 689749 is 947986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689749 - 2⁷ = 689621 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689779) 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, 4287 + ... + 4444.

It is an arithmetic number, because the mean of its divisors is an integer number (174640).

2⁶⁸⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

689749 is a deficient number, since it is larger than the sum of its proper divisors (8811).

689749 is an equidigital number, since it uses as much as digits as its factorization.

689749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8810.

The product of its digits is 108864, while the sum is 43.

The square root of 689749 is about 830.5112883038. The cubic root of 689749 is about 88.3548430669.

The spelling of 689749 in words is "six hundred eighty-nine thousand, seven hundred forty-nine".