631856 has 40 divisors (see below), whose sum is σ = 1365984. Its totient is φ = 281600.

The previous prime is 631853. The next prime is 631859. The reversal of 631856 is 658136.

631856 = T₂₇₃ + T₂₇₄ + ... + T₂₈₈.

It is an interprime number because it is at equal distance from previous prime (631853) and next prime (631859).

It is not an unprimeable number, because it can be changed into a prime (631853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6206 + ... + 6306.

2⁶³¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682992).

631856 is an abundant number, since it is smaller than the sum of its proper divisors (734128).

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

631856 is a wasteful number, since it uses less digits than its factorization.

631856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 143 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 631856 is about 794.8937035856. The cubic root of 631856 is about 85.8102903131.

The spelling of 631856 in words is "six hundred thirty-one thousand, eight hundred fifty-six".