42215550 has 48 divisors (see below), whose sum is σ = 112753200. Its totient is φ = 10391040.

The previous prime is 42215531. The next prime is 42215581. The reversal of 42215550 is 5551224.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42215550.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8875 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (2349025).

Almost surely, 2^42215550 is an apocalyptic number.

42215550 is an abundant number, since it is smaller than the sum of its proper divisors (70537650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42215550 is a wasteful number, since it uses less digits than its factorization.

42215550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21677 (or 21672 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 42215550 is about 6497.3494595873. The cubic root of 42215550 is about 348.1962989488.

Adding to 42215550 its reverse (5551224), we get a palindrome (47766774).

The spelling of 42215550 in words is "forty-two million, two hundred fifteen thousand, five hundred fifty".