531400040 has 32 divisors (see below), whose sum is σ = 1196306280. Its totient is φ = 212443392.

The previous prime is 531400033. The next prime is 531400061. The reversal of 531400040 is 40004135.

It can be written as a sum of positive squares in 4 ways, for example, as 318765316 + 212634724 = 17854^2 + 14582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531399991 and 531400018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142682 + ... + 146358.

Almost surely, 2^531400040 is an apocalyptic number.

It is an amenable number.

531400040 is an abundant number, since it is smaller than the sum of its proper divisors (664906240).

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

531400040 is a wasteful number, since it uses less digits than its factorization.

531400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7301 (or 7297 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 531400040 is about 23052.1157380402. The cubic root of 531400040 is about 809.9791896294.

Adding to 531400040 its reverse (40004135), we get a palindrome (571404175).

The spelling of 531400040 in words is "five hundred thirty-one million, four hundred thousand, forty".