631408 has 40 divisors (see below), whose sum is σ = 1349120. Its totient is φ = 285120.

The previous prime is 631399. The next prime is 631409. The reversal of 631408 is 804136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631409) 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, 9391 + ... + 9457.

It is an arithmetic number, because the mean of its divisors is an integer number (33728).

2⁶³¹⁴⁰⁸ 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 631408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674560).

631408 is an abundant number, since it is smaller than the sum of its proper divisors (717712).

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

631408 is a wasteful number, since it uses less digits than its factorization.

631408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 631408 is about 794.6118549330. The cubic root of 631408 is about 85.7900050481.

The spelling of 631408 in words is "six hundred thirty-one thousand, four hundred eight".