40404009 has 4 divisors (see below), whose sum is σ = 53872016. Its totient is φ = 26936004.

The previous prime is 40403999. The next prime is 40404017. The reversal of 40404009 is 90040404.

It is a happy number.

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 40404009 - 2¹⁵ = 40371241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40404209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6733999 + ... + 6734004.

It is an arithmetic number, because the mean of its divisors is an integer number (13468004).

Almost surely, 2^40404009 is an apocalyptic number.

It is an amenable number.

40404009 is a deficient number, since it is larger than the sum of its proper divisors (13468007).

40404009 is a wasteful number, since it uses less digits than its factorization.

40404009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468006.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 40404009 is about 6356.4147913741. The cubic root of 40404009 is about 343.1427438974.

The spelling of 40404009 in words is "forty million, four hundred four thousand, nine".