531380 has 18 divisors (see below), whose sum is σ = 1122786. Its totient is φ = 211248.

The previous prime is 531359. The next prime is 531383. The reversal of 531380 is 83135.

It can be written as a sum of positive squares in only one way, i.e., 425104 + 106276 = 652^2 + 326^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531383) by changing a digit.

531380 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3179 + ... + 3341.

It is an arithmetic number, because the mean of its divisors is an integer number (62377).

2⁵³¹³⁸⁰ is an apocalyptic number.

It is an amenable number.

531380 is an abundant number, since it is smaller than the sum of its proper divisors (591406).

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

531380 is a wasteful number, since it uses less digits than its factorization.

531380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 531380 is about 728.9581606649. The cubic root of 531380 is about 80.9969007603.

Multiplying 531380 by its sum of digits (20), we get a square (10627600 = 3260²).

531380 divided by its sum of digits (20) gives a square (26569 = 163²).

The spelling of 531380 in words is "five hundred thirty-one thousand, three hundred eighty".