42270917 has 4 divisors (see below), whose sum is σ = 45522540. Its totient is φ = 39019296.

The previous prime is 42270901. The next prime is 42270919. The reversal of 42270917 is 71907224.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25411681 + 16859236 = 5041^2 + 4106^2 .

It is a cyclic number.

It is not a de Polignac number, because 42270917 - 2⁴ = 42270901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42270919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625792 + ... + 1625817.

It is an arithmetic number, because the mean of its divisors is an integer number (11380635).

Almost surely, 2^42270917 is an apocalyptic number.

It is an amenable number.

42270917 is a deficient number, since it is larger than the sum of its proper divisors (3251623).

42270917 is a wasteful number, since it uses less digits than its factorization.

42270917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251622.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 42270917 is about 6501.6088009046. The cubic root of 42270917 is about 348.3484558552.

The spelling of 42270917 in words is "forty-two million, two hundred seventy thousand, nine hundred seventeen".