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689249 = 1162659
BaseRepresentation
bin10101000010001100001
31022000110202
42220101201
5134023444
622434545
75600321
oct2502141
91260422
10689249
11430930
12292a55
131b1952
1413d281
15d934e
hexa8461

689249 has 4 divisors (see below), whose sum is σ = 751920. Its totient is φ = 626580.

The previous prime is 689237. The next prime is 689257. The reversal of 689249 is 942986.

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 689249 - 24 = 689233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (689219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31319 + ... + 31340.

It is an arithmetic number, because the mean of its divisors is an integer number (187980).

2689249 is an apocalyptic number.

It is an amenable number.

689249 is a deficient number, since it is larger than the sum of its proper divisors (62671).

689249 is a wasteful number, since it uses less digits than its factorization.

689249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62670.

The product of its digits is 31104, while the sum is 38.

The square root of 689249 is about 830.2102143433. The cubic root of 689249 is about 88.3334883902. Note that the first 3 decimals are identical.

The spelling of 689249 in words is "six hundred eighty-nine thousand, two hundred forty-nine".

Divisors: 1 11 62659 689249