131530440 has 64 divisors (see below), whose sum is σ = 403004160. Its totient is φ = 34327040.

The previous prime is 131530439. The next prime is 131530459. The reversal of 131530440 is 44035131.

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, 6021 + ... + 17300.

It is an arithmetic number, because the mean of its divisors is an integer number (6296940).

Almost surely, 2^131530440 is an apocalyptic number.

131530440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131530440 is an abundant number, since it is smaller than the sum of its proper divisors (271473720).

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

131530440 is a wasteful number, since it uses less digits than its factorization.

131530440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23382 (or 23378 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 131530440 is about 11468.6721114521. The cubic root of 131530440 is about 508.5598741822.

Adding to 131530440 its reverse (44035131), we get a palindrome (175565571).

The spelling of 131530440 in words is "one hundred thirty-one million, five hundred thirty thousand, four hundred forty".