42093209 has 2 divisors, whose sum is σ = 42093210. Its totient is φ = 42093208.

The previous prime is 42093199. The next prime is 42093217. The reversal of 42093209 is 90239024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33408400 + 8684809 = 5780^2 + 2947^2 .

It is a cyclic number.

It is not a de Polignac number, because 42093209 - 2¹⁶ = 42027673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42093809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21046604 + 21046605.

It is an arithmetic number, because the mean of its divisors is an integer number (21046605).

Almost surely, 2^42093209 is an apocalyptic number.

It is an amenable number.

42093209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42093209 is an equidigital number, since it uses as much as digits as its factorization.

42093209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 42093209 is about 6487.9279434963. The cubic root of 42093209 is about 347.8596149526.

The spelling of 42093209 in words is "forty-two million, ninety-three thousand, two hundred nine".