40420009 has 4 divisors (see below), whose sum is σ = 46194304. Its totient is φ = 34645716.

The previous prime is 40420007. The next prime is 40420013. The reversal of 40420009 is 90002404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40420009 - 2¹ = 40420007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40420007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887137 + ... + 2887150.

It is an arithmetic number, because the mean of its divisors is an integer number (11548576).

Almost surely, 2^40420009 is an apocalyptic number.

It is an amenable number.

40420009 is a deficient number, since it is larger than the sum of its proper divisors (5774295).

40420009 is an equidigital number, since it uses as much as digits as its factorization.

40420009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774294.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 40420009 is about 6357.6732379071. The cubic root of 40420009 is about 343.1880327972.

The spelling of 40420009 in words is "forty million, four hundred twenty thousand, nine".