42404515 has 4 divisors (see below), whose sum is σ = 50885424. Its totient is φ = 33923608.

The previous prime is 42404513. The next prime is 42404533. The reversal of 42404515 is 51540424.

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 42404515 - 2¹ = 42404513 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 42404515.

It is not an unprimeable number, because it can be changed into a prime (42404513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240447 + ... + 4240456.

It is an arithmetic number, because the mean of its divisors is an integer number (12721356).

Almost surely, 2^42404515 is an apocalyptic number.

42404515 is a deficient number, since it is larger than the sum of its proper divisors (8480909).

42404515 is an equidigital number, since it uses as much as digits as its factorization.

42404515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8480908.

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

The square root of 42404515 is about 6511.8749220175. The cubic root of 42404515 is about 348.7150571140.

Adding to 42404515 its reverse (51540424), we get a palindrome (93944939).

The spelling of 42404515 in words is "forty-two million, four hundred four thousand, five hundred fifteen".