42074209 has 4 divisors (see below), whose sum is σ = 42868116. Its totient is φ = 41280304.

The previous prime is 42074203. The next prime is 42074213. The reversal of 42074209 is 90247024.

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 21344400 + 20729809 = 4620^2 + 4553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42074209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42074203) 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, 396874 + ... + 396979.

It is an arithmetic number, because the mean of its divisors is an integer number (10717029).

Almost surely, 2^42074209 is an apocalyptic number.

It is an amenable number.

42074209 is a deficient number, since it is larger than the sum of its proper divisors (793907).

42074209 is an equidigital number, since it uses as much as digits as its factorization.

42074209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793906.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 42074209 is about 6486.4635202859. The cubic root of 42074209 is about 347.8072682081.

The spelling of 42074209 in words is "forty-two million, seventy-four thousand, two hundred nine".