40540043 has 4 divisors (see below), whose sum is σ = 40912080. Its totient is φ = 40168008.

The previous prime is 40540037. The next prime is 40540061. The reversal of 40540043 is 34004504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40540043 - 2⁶ = 40539979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40539997 and 40540024.

It is not an unprimeable number, because it can be changed into a prime (40540543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185855 + ... + 186072.

It is an arithmetic number, because the mean of its divisors is an integer number (10228020).

Almost surely, 2^40540043 is an apocalyptic number.

40540043 is a deficient number, since it is larger than the sum of its proper divisors (372037).

40540043 is a wasteful number, since it uses less digits than its factorization.

40540043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372036.

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

The square root of 40540043 is about 6367.1063286237. The cubic root of 40540043 is about 343.5274152200.

Adding to 40540043 its reverse (34004504), we get a palindrome (74544547).

The spelling of 40540043 in words is "forty million, five hundred forty thousand, forty-three".