42215665 has 8 divisors (see below), whose sum is σ = 50693760. Its totient is φ = 33749232.

The previous prime is 42215659. The next prime is 42215671. The reversal of 42215665 is 56651224.

It is an interprime number because it is at equal distance from previous prime (42215659) and next prime (42215671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42215665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11976 + ... + 15094.

It is an arithmetic number, because the mean of its divisors is an integer number (6336720).

Almost surely, 2^42215665 is an apocalyptic number.

It is an amenable number.

42215665 is a deficient number, since it is larger than the sum of its proper divisors (8478095).

42215665 is a wasteful number, since it uses less digits than its factorization.

42215665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831.

The product of its digits is 14400, while the sum is 31.

The square root of 42215665 is about 6497.3583093439. The cubic root of 42215665 is about 348.1966151241.

Adding to 42215665 its reverse (56651224), we get a palindrome (98866889).

The spelling of 42215665 in words is "forty-two million, two hundred fifteen thousand, six hundred sixty-five".