631398 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 205896.

The previous prime is 631391. The next prime is 631399. The reversal of 631398 is 893136.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631398.

It is not an unprimeable number, because it can be changed into a prime (631391) 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, 838 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2⁶³¹³⁹⁸ is an apocalyptic number.

631398 is an abundant number, since it is smaller than the sum of its proper divisors (658842).

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

631398 is a wasteful number, since it uses less digits than its factorization.

631398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291.

The product of its digits is 3888, while the sum is 30.

The square root of 631398 is about 794.6055625277. The cubic root of 631398 is about 85.7895521425.

The spelling of 631398 in words is "six hundred thirty-one thousand, three hundred ninety-eight".