631990 has 8 divisors (see below), whose sum is σ = 1137600. Its totient is φ = 252792.

The previous prime is 631987. The next prime is 631991. The reversal of 631990 is 99136.

It is a happy number.

631990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×631990² = 798822720200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631991) 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, 31590 + ... + 31609.

It is an arithmetic number, because the mean of its divisors is an integer number (142200).

2⁶³¹⁹⁹⁰ is an apocalyptic number.

631990 is a deficient number, since it is larger than the sum of its proper divisors (505610).

631990 is a wasteful number, since it uses less digits than its factorization.

631990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63206.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 631990 is about 794.9779871166. The cubic root of 631990 is about 85.8163559178.

The spelling of 631990 in words is "six hundred thirty-one thousand, nine hundred ninety".