40013409 has 4 divisors (see below), whose sum is σ = 53351216. Its totient is φ = 26675604.

The previous prime is 40013371. The next prime is 40013419. The reversal of 40013409 is 90431004.

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 40013409 - 2⁸ = 40013153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40013419) 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, 6668899 + ... + 6668904.

It is an arithmetic number, because the mean of its divisors is an integer number (13337804).

Almost surely, 2^40013409 is an apocalyptic number.

It is an amenable number.

40013409 is a deficient number, since it is larger than the sum of its proper divisors (13337807).

40013409 is a wasteful number, since it uses less digits than its factorization.

40013409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337806.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40013409 is about 6325.6153060394. The cubic root of 40013409 is about 342.0334001784.

The spelling of 40013409 in words is "forty million, thirteen thousand, four hundred nine".