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689986 = 21179397
BaseRepresentation
bin10101000011101000010
31022001111001
42220131002
5134034421
622442214
75602423
oct2503502
91261431
10689986
11431440
1229336a
131b209b
1413d64a
15d9691
hexa8742

689986 has 16 divisors (see below), whose sum is σ = 1146240. Its totient is φ = 308880.

The previous prime is 689981. The next prime is 689987.

It is a happy number.

689986 is nontrivially palindromic in base 10.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (689981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540 + ... + 1936.

It is an arithmetic number, because the mean of its divisors is an integer number (71640).

2689986 is an apocalyptic number.

689986 is a deficient number, since it is larger than the sum of its proper divisors (456254).

689986 is a wasteful number, since it uses less digits than its factorization.

689986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 186624, while the sum is 46.

The square root of 689986 is about 830.6539592393. The cubic root of 689986 is about 88.3649615785.

The spelling of 689986 in words is "six hundred eighty-nine thousand, nine hundred eighty-six".

Divisors: 1 2 11 22 79 158 397 794 869 1738 4367 8734 31363 62726 344993 689986