531640 has 16 divisors (see below), whose sum is σ = 1196280. Its totient is φ = 212640.

The previous prime is 531637. The next prime is 531667. The reversal of 531640 is 46135.

It is a plaindrome in base 11.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6606 + ... + 6685.

2⁵³¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

531640 is an abundant number, since it is smaller than the sum of its proper divisors (664640).

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

531640 is a wasteful number, since it uses less digits than its factorization.

531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302 (or 13298 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 531640 is about 729.1364755654. The cubic root of 531640 is about 81.0101089857.

Adding to 531640 its reverse (46135), we get a palindrome (577775).

It can be divided in two parts, 5316 and 40, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 531640 in words is "five hundred thirty-one thousand, six hundred forty".