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40686 = 236781
BaseRepresentation
bin1001111011101110
32001210220
421323232
52300221
6512210
7226422
oct117356
961726
1040686
1128628
121b666
1315699
1410b82
15c0c6
hex9eee

40686 has 8 divisors (see below), whose sum is σ = 81384. Its totient is φ = 13560.

The previous prime is 40639. The next prime is 40693. The reversal of 40686 is 68604.

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

40686 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 13 and base 16.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3385 + ... + 3396.

It is an arithmetic number, because the mean of its divisors is an integer number (10173).

240686 is an apocalyptic number.

40686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40692).

40686 is a wasteful number, since it uses less digits than its factorization.

40686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 40686 is about 201.7077093222. The cubic root of 40686 is about 34.3939190621.

The spelling of 40686 in words is "forty thousand, six hundred eighty-six".

Divisors: 1 2 3 6 6781 13562 20343 40686