531404040 has 64 divisors (see below), whose sum is σ = 1600508160. Its totient is φ = 141148160.

The previous prime is 531404021. The next prime is 531404047. The reversal of 531404040 is 40404135.

It is a junction number, because it is equal to n+sod(n) for n = 531403998 and 531404016.

It is not an unprimeable number, because it can be changed into a prime (531404047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22225 + ... + 39455.

It is an arithmetic number, because the mean of its divisors is an integer number (25007940).

Almost surely, 2^531404040 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 531404040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800254080).

531404040 is an abundant number, since it is smaller than the sum of its proper divisors (1069104120).

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

531404040 is a wasteful number, since it uses less digits than its factorization.

531404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502 (or 17498 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 531404040 is about 23052.2024978092. The cubic root of 531404040 is about 809.9812219393.

Adding to 531404040 its reverse (40404135), we get a palindrome (571808175).

The spelling of 531404040 in words is "five hundred thirty-one million, four hundred four thousand, forty".