42165215 has 4 divisors (see below), whose sum is σ = 50598264. Its totient is φ = 33732168.

The previous prime is 42165197. The next prime is 42165229. The reversal of 42165215 is 51256124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42165215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4216517 + ... + 4216526.

It is an arithmetic number, because the mean of its divisors is an integer number (12649566).

Almost surely, 2^42165215 is an apocalyptic number.

42165215 is a deficient number, since it is larger than the sum of its proper divisors (8433049).

42165215 is an equidigital number, since it uses as much as digits as its factorization.

42165215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8433048.

The product of its digits is 2400, while the sum is 26.

The square root of 42165215 is about 6493.4748016759. The cubic root of 42165215 is about 348.0578552465.

Subtracting 42165215 from its reverse (51256124), we obtain a palindrome (9090909).

The spelling of 42165215 in words is "forty-two million, one hundred sixty-five thousand, two hundred fifteen".