43540040 has 32 divisors (see below), whose sum is σ = 99351360. Its totient is φ = 17169600.

The previous prime is 43540033. The next prime is 43540069. The reversal of 43540040 is 4004534.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 43539994 and 43540021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4826 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (3104730).

Almost surely, 2^43540040 is an apocalyptic number.

43540040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43540040 is an abundant number, since it is smaller than the sum of its proper divisors (55811320).

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

43540040 is a wasteful number, since it uses less digits than its factorization.

43540040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15413 (or 15409 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 43540040 is about 6598.4877055277. The cubic root of 43540040 is about 351.8003559696.

Adding to 43540040 its reverse (4004534), we get a palindrome (47544574).

The spelling of 43540040 in words is "forty-three million, five hundred forty thousand, forty".