531990 has 48 divisors (see below), whose sum is σ = 1448928. Its totient is φ = 135168.

The previous prime is 531989. The next prime is 531997. The reversal of 531990 is 99135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1942 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (30186).

2⁵³¹⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724464).

531990 is an abundant number, since it is smaller than the sum of its proper divisors (916938).

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

531990 is a wasteful number, since it uses less digits than its factorization.

With its successor (531991) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (293).

531990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 531990 is about 729.3764460140. The cubic root of 531990 is about 81.0278824906.

It can be divided in two parts, 531 and 990, that added together give a square (1521 = 39²).

The spelling of 531990 in words is "five hundred thirty-one thousand, nine hundred ninety".