634986 has 32 divisors (see below), whose sum is σ = 1540800. Its totient is φ = 192240.

The previous prime is 634979. The next prime is 635003. The reversal of 634986 is 689436.

It is a self number, because there is not a number n which added to its sum of digits gives 634986.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (48150).

2⁶³⁴⁹⁸⁶ is an apocalyptic number.

634986 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 634986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770400).

634986 is an abundant number, since it is smaller than the sum of its proper divisors (905814).

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

634986 is a wasteful number, since it uses less digits than its factorization.

634986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091 (or 1085 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 634986 is about 796.8600880958. The cubic root of 634986 is about 85.9517486677.

It can be divided in two parts, 63498 and 6, that added together give a square (63504 = 252²).

The spelling of 634986 in words is "six hundred thirty-four thousand, nine hundred eighty-six".