42215345 has 4 divisors (see below), whose sum is σ = 50658420. Its totient is φ = 33772272.

The previous prime is 42215339. The next prime is 42215351. The reversal of 42215345 is 54351224.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42215339) and next prime (42215351).

It can be written as a sum of positive squares in 2 ways, for example, as 5721664 + 36493681 = 2392^2 + 6041^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215345 - 2¹⁰ = 42214321 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 4221530 + ... + 4221539.

It is an arithmetic number, because the mean of its divisors is an integer number (12664605).

Almost surely, 2^42215345 is an apocalyptic number.

It is an amenable number.

42215345 is a deficient number, since it is larger than the sum of its proper divisors (8443075).

42215345 is an equidigital number, since it uses as much as digits as its factorization.

42215345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8443074.

The product of its digits is 4800, while the sum is 26.

The square root of 42215345 is about 6497.3336839045. Note that the first 3 decimals coincide. The cubic root of 42215345 is about 348.1957353306.

Adding to 42215345 its reverse (54351224), we get a palindrome (96566569).

The spelling of 42215345 in words is "forty-two million, two hundred fifteen thousand, three hundred forty-five".