631986 has 8 divisors (see below), whose sum is σ = 1263984. Its totient is φ = 210660.

The previous prime is 631979. The next prime is 631987. The reversal of 631986 is 689136.

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

631986 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631987) 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, 52660 + ... + 52671.

It is an arithmetic number, because the mean of its divisors is an integer number (157998).

2⁶³¹⁹⁸⁶ is an apocalyptic number.

631986 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.

631986 is a wasteful number, since it uses less digits than its factorization.

631986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105336.

The product of its digits is 7776, while the sum is 33.

The square root of 631986 is about 794.9754713197. The cubic root of 631986 is about 85.8161748674.

The spelling of 631986 in words is "six hundred thirty-one thousand, nine hundred eighty-six".