2043409 has 2 divisors, whose sum is σ = 2043410. Its totient is φ = 2043408.

The previous prime is 2043401. The next prime is 2043413. The reversal of 2043409 is 9043402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2039184 + 4225 = 1428^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043409 - 2³ = 2043401 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2043409.

It is not a weakly prime, because it can be changed into another prime (2043401) 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 as a sum of consecutive naturals, namely, 1021704 + 1021705.

It is an arithmetic number, because the mean of its divisors is an integer number (1021705).

2^2043409 is an apocalyptic number.

It is an amenable number.

2043409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2043409 is an equidigital number, since it uses as much as digits as its factorization.

2043409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2043409 is about 1429.4785762648. The cubic root of 2043409 is about 126.8971204768.

The spelling of 2043409 in words is "two million, forty-three thousand, four hundred nine".