42540405 has 32 divisors (see below), whose sum is σ = 70447104. Its totient is φ = 21907776.

The previous prime is 42540403. The next prime is 42540413. The reversal of 42540405 is 50404524.

42540405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42540405 - 2¹ = 42540403 is a prime.

It is a super-3 number, since 3×42540405³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58152 + ... + 58878.

It is an arithmetic number, because the mean of its divisors is an integer number (2201472).

Almost surely, 2^42540405 is an apocalyptic number.

It is an amenable number.

42540405 is a deficient number, since it is larger than the sum of its proper divisors (27906699).

42540405 is a wasteful number, since it uses less digits than its factorization.

42540405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 42540405 is about 6522.3005910491. The cubic root of 42540405 is about 349.0871586869.

Adding to 42540405 its reverse (50404524), we get a palindrome (92944929).

The spelling of 42540405 in words is "forty-two million, five hundred forty thousand, four hundred five".