2040409 has 6 divisors (see below), whose sum is σ = 2373594.
Its totient is φ = 1748880.
The previous prime is 2040407. The next prime is 2040427. The reversal of 2040409 is 9040402.
It can be written as a sum of positive squares in only one way, i.e., 2039184 + 1225 = 1428^2 + 35^2
It is not a de Polignac number, because 2040409 - 21 = 2040407 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2040403) 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 5 ways as a sum of consecutive naturals, for example, 20772 + ... + 20869.
It is an arithmetic number, because the mean of its divisors is an integer number (395599).
22040409 is an apocalyptic number.
It is an amenable number.
2040409 is a deficient number, since it is larger than the sum of its proper divisors (333185).
2040409 is an equidigital number, since it uses as much as digits as its factorization.
2040409 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 41655 (or 41648 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 19.
The square root of 2040409 is about 1428.4288571714.
The cubic root of 2040409 is about 126.8349893656.
The spelling of 2040409 in words is "two million, forty thousand, four hundred nine".