131630440 has 32 divisors (see below), whose sum is σ = 297821160. Its totient is φ = 52358400.

The previous prime is 131630431. The next prime is 131630441. The reversal of 131630440 is 44036131.

It can be written as a sum of positive squares in 4 ways, for example, as 98843364 + 32787076 = 9942^2 + 5726^2 .

It is not an unprimeable number, because it can be changed into a prime (131630441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1851 + ... + 16330.

Almost surely, 2^131630440 is an apocalyptic number.

131630440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131630440 is an abundant number, since it is smaller than the sum of its proper divisors (166190720).

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

131630440 is a wasteful number, since it uses less digits than its factorization.

131630440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18373 (or 18369 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 131630440 is about 11473.0309857509. The cubic root of 131630440 is about 508.6887242151.

Adding to 131630440 its reverse (44036131), we get a palindrome (175666571).

The spelling of 131630440 in words is "one hundred thirty-one million, six hundred thirty thousand, four hundred forty".