7978965 has 16 divisors (see below), whose sum is σ = 12831936. Its totient is φ = 4233600.

The previous prime is 7978961. The next prime is 7978979. The reversal of 7978965 is 5698797.

7978965 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 7978965 - 2² = 7978961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905 + ... + 4425.

It is an arithmetic number, because the mean of its divisors is an integer number (801996).

Almost surely, 2^7978965 is an apocalyptic number.

It is an amenable number.

7978965 is a deficient number, since it is larger than the sum of its proper divisors (4852971).

7978965 is a wasteful number, since it uses less digits than its factorization.

7978965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740.

The product of its digits is 952560, while the sum is 51.

The square root of 7978965 is about 2824.7061794105. The cubic root of 7978965 is about 199.8245544727.

The spelling of 7978965 in words is "seven million, nine hundred seventy-eight thousand, nine hundred sixty-five".