78946409 has 8 divisors (see below), whose sum is σ = 80963520. Its totient is φ = 76937616.

The previous prime is 78946397. The next prime is 78946421. The reversal of 78946409 is 90464987.

It is an interprime number because it is at equal distance from previous prime (78946397) and next prime (78946421).

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 78946409 - 2⁴ = 78946393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78946459) 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, 20084 + ... + 23690.

It is an arithmetic number, because the mean of its divisors is an integer number (10120440).

Almost surely, 2^78946409 is an apocalyptic number.

It is an amenable number.

78946409 is a deficient number, since it is larger than the sum of its proper divisors (2017111).

78946409 is a wasteful number, since it uses less digits than its factorization.

78946409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 78946409 is about 8885.1791765839. The cubic root of 78946409 is about 428.9869952571.

The spelling of 78946409 in words is "seventy-eight million, nine hundred forty-six thousand, four hundred nine".