Search a number
-
+
689145 = 3545943
BaseRepresentation
bin10101000001111111001
31022000022220
42220033321
5134023040
622434253
75600112
oct2501771
91260286
10689145
11430846
12292989
131b18a2
1413d209
15d92d0
hexa83f9

689145 has 8 divisors (see below), whose sum is σ = 1102656. Its totient is φ = 367536.

The previous prime is 689141. The next prime is 689167. The reversal of 689145 is 541986.

689145 = 2582 + 2592 + ... + 2672.

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

It is not a de Polignac number, because 689145 - 22 = 689141 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (689141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22957 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (137832).

2689145 is an apocalyptic number.

It is an amenable number.

689145 is a deficient number, since it is larger than the sum of its proper divisors (413511).

689145 is a wasteful number, since it uses less digits than its factorization.

689145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45951.

The product of its digits is 8640, while the sum is 33.

The square root of 689145 is about 830.1475772415. The cubic root of 689145 is about 88.3290453201.

The spelling of 689145 in words is "six hundred eighty-nine thousand, one hundred forty-five".

Divisors: 1 3 5 15 45943 137829 229715 689145