631240 has 32 divisors (see below), whose sum is σ = 1457280. Its totient is φ = 245952.

The previous prime is 631229. The next prime is 631247. The reversal of 631240 is 42136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (45540).

2⁶³¹²⁴⁰ 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 631240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728640).

631240 is an abundant number, since it is smaller than the sum of its proper divisors (826040).

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

631240 is a wasteful number, since it uses less digits than its factorization.

631240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 631240 is about 794.5061359109. The cubic root of 631240 is about 85.7823956000.

Adding to 631240 its reverse (42136), we get a palindrome (673376).

The spelling of 631240 in words is "six hundred thirty-one thousand, two hundred forty".