42540043 has 8 divisors (see below), whose sum is σ = 52357088. Its totient is φ = 33657984.

The previous prime is 42540037. The next prime is 42540059. The reversal of 42540043 is 34004524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42540043 - 2²⁵ = 8985611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42539996 and 42540023.

It is not an unprimeable number, because it can be changed into a prime (42541043) 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, 233646 + ... + 233827.

It is an arithmetic number, because the mean of its divisors is an integer number (6544636).

Almost surely, 2^42540043 is an apocalyptic number.

42540043 is a deficient number, since it is larger than the sum of its proper divisors (9817045).

42540043 is a wasteful number, since it uses less digits than its factorization.

42540043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467493.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42540043 is about 6522.2728400459. The cubic root of 42540043 is about 349.0861684917.

Adding to 42540043 its reverse (34004524), we get a palindrome (76544567).

The spelling of 42540043 in words is "forty-two million, five hundred forty thousand, forty-three".