31686714 has 56 divisors (see below), whose sum is σ = 72295392. Its totient is φ = 10410120.

The previous prime is 31686713. The next prime is 31686719. The reversal of 31686714 is 41768613.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (31686713) 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 27 ways as a sum of consecutive naturals, for example, 150069 + ... + 150279.

Almost surely, 2^31686714 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31686714, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36147696).

31686714 is an abundant number, since it is smaller than the sum of its proper divisors (40608678).

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

31686714 is a wasteful number, since it uses less digits than its factorization.

31686714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 319 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 31686714 is about 5629.0953091949. The cubic root of 31686714 is about 316.4407472017.

It can be divided in two parts, 31686 and 714, that added together give a square (32400 = 180²).

The spelling of 31686714 in words is "thirty-one million, six hundred eighty-six thousand, seven hundred fourteen".