40078409 has 8 divisors (see below), whose sum is σ = 45903360. Its totient is φ = 34278336.

The previous prime is 40078369. The next prime is 40078411. The reversal of 40078409 is 90487004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40078409 - 2²⁰ = 39029833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40078499) 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 7 ways as a sum of consecutive naturals, for example, 2624 + ... + 9329.

It is an arithmetic number, because the mean of its divisors is an integer number (5737920).

Almost surely, 2^40078409 is an apocalyptic number.

It is an amenable number.

40078409 is a deficient number, since it is larger than the sum of its proper divisors (5824951).

40078409 is a wasteful number, since it uses less digits than its factorization.

40078409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12439.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 40078409 is about 6330.7510612881. The cubic root of 40078409 is about 342.2185059885.

The spelling of 40078409 in words is "forty million, seventy-eight thousand, four hundred nine".