42850009 has 2 divisors, whose sum is σ = 42850010. Its totient is φ = 42850008.

The previous prime is 42850007. The next prime is 42850019. The reversal of 42850009 is 90005824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42614784 + 235225 = 6528^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 42850009 - 2¹ = 42850007 is a prime.

It is a super-2 number, since 2×42850009² = 3672246542600162, which contains 22 as substring.

Together with 42850007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42850001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21425004 + 21425005.

It is an arithmetic number, because the mean of its divisors is an integer number (21425005).

Almost surely, 2^42850009 is an apocalyptic number.

It is an amenable number.

42850009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42850009 is an equidigital number, since it uses as much as digits as its factorization.

42850009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 42850009 is about 6545.9918270649. The cubic root of 42850009 is about 349.9319840621.

The spelling of 42850009 in words is "forty-two million, eight hundred fifty thousand, nine".