43131540 has 48 divisors (see below), whose sum is σ = 124669440. Its totient is φ = 11130240.

The previous prime is 43131523. The next prime is 43131553. The reversal of 43131540 is 4513134.

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, 9735 + ... + 13454.

It is an arithmetic number, because the mean of its divisors is an integer number (2597280).

Almost surely, 2^43131540 is an apocalyptic number.

It is an amenable number.

43131540 is an abundant number, since it is smaller than the sum of its proper divisors (81537900).

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

43131540 is a wasteful number, since it uses less digits than its factorization.

43131540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23232 (or 23230 counting only the distinct ones).

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

The square root of 43131540 is about 6567.4606964945. The cubic root of 43131540 is about 350.6966803542.

Adding to 43131540 its reverse (4513134), we get a palindrome (47644674).

The spelling of 43131540 in words is "forty-three million, one hundred thirty-one thousand, five hundred forty".