42540415 has 4 divisors (see below), whose sum is σ = 51048504. Its totient is φ = 34032328.

The previous prime is 42540413. The next prime is 42540437. The reversal of 42540415 is 51404524.

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 42540415 - 2¹ = 42540413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42540415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540413) 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, 4254037 + ... + 4254046.

It is an arithmetic number, because the mean of its divisors is an integer number (12762126).

Almost surely, 2^42540415 is an apocalyptic number.

42540415 is a deficient number, since it is larger than the sum of its proper divisors (8508089).

42540415 is an equidigital number, since it uses as much as digits as its factorization.

42540415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508088.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 42540415 is about 6522.3013576498. The cubic root of 42540415 is about 349.0871860403.

Adding to 42540415 its reverse (51404524), we get a palindrome (93944939).

The spelling of 42540415 in words is "forty-two million, five hundred forty thousand, four hundred fifteen".