631388 has 12 divisors (see below), whose sum is σ = 1143240. Its totient is φ = 304752.

The previous prime is 631387. The next prime is 631391. The reversal of 631388 is 883136.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 631388.

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 631388.

It is not an unprimeable number, because it can be changed into a prime (631387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2606 + ... + 2837.

It is an arithmetic number, because the mean of its divisors is an integer number (95270).

2⁶³¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

631388 is a deficient number, since it is larger than the sum of its proper divisors (511852).

631388 is a wasteful number, since it uses less digits than its factorization.

631388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5476 (or 5474 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 631388 is about 794.5992700727. The cubic root of 631388 is about 85.7890992322.

The spelling of 631388 in words is "six hundred thirty-one thousand, three hundred eighty-eight".