42421615 has 4 divisors (see below), whose sum is σ = 50905944. Its totient is φ = 33937288.

The previous prime is 42421559. The next prime is 42421619. The reversal of 42421615 is 51612424.

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 42421615 - 2¹⁹ = 41897327 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 42421615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42421619) 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, 4242157 + ... + 4242166.

It is an arithmetic number, because the mean of its divisors is an integer number (12726486).

Almost surely, 2^42421615 is an apocalyptic number.

42421615 is a deficient number, since it is larger than the sum of its proper divisors (8484329).

42421615 is an equidigital number, since it uses as much as digits as its factorization.

42421615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8484328.

The product of its digits is 1920, while the sum is 25.

The square root of 42421615 is about 6513.1877755827. The cubic root of 42421615 is about 348.7619249700.

The spelling of 42421615 in words is "forty-two million, four hundred twenty-one thousand, six hundred fifteen".