40404409 has 2 divisors, whose sum is σ = 40404410. Its totient is φ = 40404408.

The previous prime is 40404389. The next prime is 40404433. The reversal of 40404409 is 90440404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27008809 + 13395600 = 5197^2 + 3660^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404409 - 2⁹ = 40403897 is a prime.

It is not a weakly prime, because it can be changed into another prime (40404499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202204 + 20202205.

It is an arithmetic number, because the mean of its divisors is an integer number (20202205).

Almost surely, 2^40404409 is an apocalyptic number.

It is an amenable number.

40404409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404409 is an equidigital number, since it uses as much as digits as its factorization.

40404409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 40404409 is about 6356.4462555739. The cubic root of 40404409 is about 343.1438762656.

The spelling of 40404409 in words is "forty million, four hundred four thousand, four hundred nine".