631140 has 48 divisors (see below), whose sum is σ = 1804992. Its totient is φ = 164736.

The previous prime is 631139. The next prime is 631151. The reversal of 631140 is 41136.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 3942 + ... + 4098.

It is an arithmetic number, because the mean of its divisors is an integer number (37604).

2⁶³¹¹⁴⁰ is an apocalyptic number.

631140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902496).

631140 is an abundant number, since it is smaller than the sum of its proper divisors (1173852).

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

631140 is a wasteful number, since it uses less digits than its factorization.

631140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 631140 is about 794.4432012422. The cubic root of 631140 is about 85.7778655255. Note that the first 3 decimals are identical.

Adding to 631140 its reverse (41136), we get a palindrome (672276).

The spelling of 631140 in words is "six hundred thirty-one thousand, one hundred forty".