531986 has 32 divisors (see below), whose sum is σ = 1021440. Its totient is φ = 202176.

The previous prime is 531983. The next prime is 531989. The reversal of 531986 is 689135.

It is an interprime number because it is at equal distance from previous prime (531983) and next prime (531989).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6695 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2⁵³¹⁹⁸⁶ is an apocalyptic number.

531986 is a deficient number, since it is larger than the sum of its proper divisors (489454).

531986 is a wasteful number, since it uses less digits than its factorization.

531986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138.

The product of its digits is 6480, while the sum is 32.

The square root of 531986 is about 729.3737039406. The cubic root of 531986 is about 81.0276794089.

The spelling of 531986 in words is "five hundred thirty-one thousand, nine hundred eighty-six".