40409409 has 8 divisors (see below), whose sum is σ = 56715040. Its totient is φ = 25521696.

The previous prime is 40409401. The next prime is 40409443. The reversal of 40409409 is 90490404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40409409 - 2³ = 40409401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40409401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354412 + ... + 354525.

It is an arithmetic number, because the mean of its divisors is an integer number (7089380).

Almost surely, 2^40409409 is an apocalyptic number.

It is an amenable number.

40409409 is a deficient number, since it is larger than the sum of its proper divisors (16305631).

40409409 is a wasteful number, since it uses less digits than its factorization.

40409409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708959.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40409409 is about 6356.8395449311. The cubic root of 40409409 is about 343.1580302376.

The spelling of 40409409 in words is "forty million, four hundred nine thousand, four hundred nine".