42289209 has 20 divisors (see below), whose sum is σ = 63580176. Its totient is φ = 28011096.

The previous prime is 42289189. The next prime is 42289213. The reversal of 42289209 is 90298224.

It is not a de Polignac number, because 42289209 - 2¹³ = 42281017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42289229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11602 + ... + 14804.

Almost surely, 2^42289209 is an apocalyptic number.

It is an amenable number.

42289209 is a deficient number, since it is larger than the sum of its proper divisors (21290967).

42289209 is a wasteful number, since it uses less digits than its factorization.

42289209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 42289209 is about 6503.0153774999. The cubic root of 42289209 is about 348.3986958429.

The spelling of 42289209 in words is "forty-two million, two hundred eighty-nine thousand, two hundred nine".