653689 has 4 divisors (see below), whose sum is σ = 676260. Its totient is φ = 631120.

The previous prime is 653687. The next prime is 653693. The reversal of 653689 is 986356.

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

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 218089 = 660^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 653689 - 2¹ = 653687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11242 + ... + 11299.

It is an arithmetic number, because the mean of its divisors is an integer number (169065).

2⁶⁵³⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

653689 is a deficient number, since it is larger than the sum of its proper divisors (22571).

653689 is a wasteful number, since it uses less digits than its factorization.

653689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22570.

The product of its digits is 38880, while the sum is 37.

The square root of 653689 is about 808.5103586226. The cubic root of 653689 is about 86.7874761604.

The spelling of 653689 in words is "six hundred fifty-three thousand, six hundred eighty-nine".