7978117 has 8 divisors (see below), whose sum is σ = 9654336. Its totient is φ = 6436032.

The previous prime is 7978099. The next prime is 7978169. The reversal of 7978117 is 7118797.

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 7978117 - 2⁷ = 7977989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7973117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33403 + ... + 33640.

It is an arithmetic number, because the mean of its divisors is an integer number (1206792).

Almost surely, 2^7978117 is an apocalyptic number.

It is an amenable number.

7978117 is a deficient number, since it is larger than the sum of its proper divisors (1676219).

7978117 is a wasteful number, since it uses less digits than its factorization.

7978117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67067.

The product of its digits is 24696, while the sum is 40.

The square root of 7978117 is about 2824.5560713146. The cubic root of 7978117 is about 199.8174751407.

The spelling of 7978117 in words is "seven million, nine hundred seventy-eight thousand, one hundred seventeen".