531390 has 16 divisors (see below), whose sum is σ = 1275408. Its totient is φ = 141696.

The previous prime is 531383. The next prime is 531457. The reversal of 531390 is 93135.

531390 = 324² + 325² + ... + 328².

It is a Curzon number.

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

531390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8827 + ... + 8886.

It is an arithmetic number, because the mean of its divisors is an integer number (79713).

531390 is a Friedman number, since it can be written as 9^(3+3+0)-51, using all its digits and the basic arithmetic operations.

2⁵³¹³⁹⁰ is an apocalyptic number.

531390 is an abundant number, since it is smaller than the sum of its proper divisors (744018).

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

531390 is a wasteful number, since it uses less digits than its factorization.

531390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17723.

The product of its (nonzero) digits is 405, while the sum is 21.

The square root of 531390 is about 728.9650197369. The cubic root of 531390 is about 80.9974088487.

The spelling of 531390 in words is "five hundred thirty-one thousand, three hundred ninety".