631390 has 16 divisors (see below), whose sum is σ = 1149408. Its totient is φ = 249696.

The previous prime is 631387. The next prime is 631391. The reversal of 631390 is 93136.

631390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 724 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (71838).

2⁶³¹³⁹⁰ is an apocalyptic number.

631390 is a deficient number, since it is larger than the sum of its proper divisors (518018).

631390 is a wasteful number, since it uses less digits than its factorization.

631390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 631390 is about 794.6005285677. The cubic root of 631390 is about 85.7891898147.

The spelling of 631390 in words is "six hundred thirty-one thousand, three hundred ninety".