42785209 has 16 divisors (see below), whose sum is σ = 46884096. Its totient is φ = 38880000.

The previous prime is 42785191. The next prime is 42785251. The reversal of 42785209 is 90258724.

It is a cyclic number.

It is not a de Polignac number, because 42785209 - 2⁹ = 42784697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (42785269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157744 + ... + 158014.

It is an arithmetic number, because the mean of its divisors is an integer number (2930256).

Almost surely, 2^42785209 is an apocalyptic number.

It is an amenable number.

42785209 is a deficient number, since it is larger than the sum of its proper divisors (4098887).

42785209 is a wasteful number, since it uses less digits than its factorization.

42785209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 42785209 is about 6541.0403606766. The cubic root of 42785209 is about 349.7554999873.

The spelling of 42785209 in words is "forty-two million, seven hundred eighty-five thousand, two hundred nine".