689737 has 4 divisors (see below), whose sum is σ = 695296. Its totient is φ = 684180.

The previous prime is 689723. The next prime is 689761. The reversal of 689737 is 737986.

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 689737 - 2¹⁹ = 165449 is a prime.

It is a Duffinian number.

689737 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 689737.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689737.

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 3 ways as a sum of consecutive naturals, for example, 2589 + ... + 2842.

It is an arithmetic number, because the mean of its divisors is an integer number (173824).

2⁶⁸⁹⁷³⁷ is an apocalyptic number.

It is an amenable number.

689737 is a deficient number, since it is larger than the sum of its proper divisors (5559).

689737 is a wasteful number, since it uses less digits than its factorization.

689737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558.

The product of its digits is 63504, while the sum is 40.

The square root of 689737 is about 830.5040638070. The cubic root of 689737 is about 88.3543306755.

The spelling of 689737 in words is "six hundred eighty-nine thousand, seven hundred thirty-seven".