40443540 has 24 divisors (see below), whose sum is σ = 113242080. Its totient is φ = 10784928.

The previous prime is 40443523. The next prime is 40443541. The reversal of 40443540 is 4534404.

It is a self number, because there is not a number n which added to its sum of digits gives 40443540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40443541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336970 + ... + 337089.

It is an arithmetic number, because the mean of its divisors is an integer number (4718420).

Almost surely, 2^40443540 is an apocalyptic number.

It is an amenable number.

40443540 is an abundant number, since it is smaller than the sum of its proper divisors (72798540).

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

40443540 is a wasteful number, since it uses less digits than its factorization.

40443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674071 (or 674069 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 40443540 is about 6359.5235670607. The cubic root of 40443540 is about 343.2546169075.

Adding to 40443540 its reverse (4534404), we get a palindrome (44977944).

The spelling of 40443540 in words is "forty million, four hundred forty-three thousand, five hundred forty".