631940 has 24 divisors (see below), whose sum is σ = 1397760. Its totient is φ = 239328.

The previous prime is 631937. The next prime is 631979. The reversal of 631940 is 49136.

631940 = 76² + 77² + ... + 132².

It is an unprimeable number.

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, 452 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (58240).

2⁶³¹⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

631940 is an abundant number, since it is smaller than the sum of its proper divisors (765820).

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

631940 is a wasteful number, since it uses less digits than its factorization.

631940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 631940 is about 794.9465390830. The cubic root of 631940 is about 85.8140927328.

The spelling of 631940 in words is "six hundred thirty-one thousand, nine hundred forty".