531420 has 48 divisors (see below), whose sum is σ = 1578528. Its totient is φ = 133120.

The previous prime is 531383. The next prime is 531457. The reversal of 531420 is 24135.

531420 = T₃₂₁ + T₃₂₂ + ... + T₃₃₀.

531420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (531383) and next prime (531457).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 531420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (32886).

2⁵³¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789264).

531420 is an abundant number, since it is smaller than the sum of its proper divisors (1047108).

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

531420 is a wasteful number, since it uses less digits than its factorization.

531420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 531420 is about 728.9855965655. The cubic root of 531420 is about 80.9989330754.

Adding to 531420 its reverse (24135), we get a palindrome (555555).

The spelling of 531420 in words is "five hundred thirty-one thousand, four hundred twenty".