42165217 has 12 divisors (see below), whose sum is σ = 44069116. Its totient is φ = 40340160.

The previous prime is 42165197. The next prime is 42165229. The reversal of 42165217 is 71256124.

It can be written as a sum of positive squares in 6 ways, for example, as 9492561 + 32672656 = 3081^2 + 5716^2 .

It is not a de Polignac number, because 42165217 - 2¹⁵ = 42132449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42165247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152083 + ... + 152359.

Almost surely, 2^42165217 is an apocalyptic number.

It is an amenable number.

42165217 is a deficient number, since it is larger than the sum of its proper divisors (1903899).

42165217 is a wasteful number, since it uses less digits than its factorization.

42165217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 487 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 42165217 is about 6493.4749556767. The cubic root of 42165217 is about 348.0578607495.

The spelling of 42165217 in words is "forty-two million, one hundred sixty-five thousand, two hundred seventeen".