7978289 has 8 divisors (see below), whose sum is σ = 8814720. Its totient is φ = 7160400.

The previous prime is 7978279. The next prime is 7978301. The reversal of 7978289 is 9828797.

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 a de Polignac number, because none of the positive numbers 2^k-7978289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7978279) 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, 3722 + ... + 5459.

It is an arithmetic number, because the mean of its divisors is an integer number (1101840).

Almost surely, 2^7978289 is an apocalyptic number.

7978289 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

7978289 is a deficient number, since it is larger than the sum of its proper divisors (836431).

7978289 is a wasteful number, since it uses less digits than its factorization.

7978289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271.

The product of its digits is 508032, while the sum is 50.

The square root of 7978289 is about 2824.5865184129. The cubic root of 7978289 is about 199.8189110835.

The spelling of 7978289 in words is "seven million, nine hundred seventy-eight thousand, two hundred eighty-nine".