42040415 has 4 divisors (see below), whose sum is σ = 50448504. Its totient is φ = 33632328.

The previous prime is 42040409. The next prime is 42040417. The reversal of 42040415 is 51404024.

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 42040415 - 2⁶ = 42040351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040417) 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, 4204037 + ... + 4204046.

It is an arithmetic number, because the mean of its divisors is an integer number (12612126).

Almost surely, 2^42040415 is an apocalyptic number.

42040415 is a deficient number, since it is larger than the sum of its proper divisors (8408089).

42040415 is an equidigital number, since it uses as much as digits as its factorization.

42040415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8408088.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42040415 is about 6483.8580336093. The cubic root of 42040415 is about 347.7141236793.

Adding to 42040415 its reverse (51404024), we get a palindrome (93444439).

The spelling of 42040415 in words is "forty-two million, forty thousand, four hundred fifteen".