Search a number
-
+
31386 = 235231
BaseRepresentation
bin111101010011010
31121001110
413222122
52001021
6401150
7160335
oct75232
947043
1031386
1121643
12161b6
1311394
14b61c
159476
hex7a9a

31386 has 8 divisors (see below), whose sum is σ = 62784. Its totient is φ = 10460.

The previous prime is 31379. The next prime is 31387. The reversal of 31386 is 68313.

Adding to 31386 its reverse (68313), we get a palindrome (99699).

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

31386 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (7848).

231386 is an apocalyptic number.

31386 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 (31392).

31386 is a wasteful number, since it uses less digits than its factorization.

31386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236.

The product of its digits is 432, while the sum is 21.

The square root of 31386 is about 177.1609437771. The cubic root of 31386 is about 31.5436532584.

The spelling of 31386 in words is "thirty-one thousand, three hundred eighty-six".

Divisors: 1 2 3 6 5231 10462 15693 31386