7978975 has 6 divisors (see below), whose sum is σ = 9893960. Its totient is φ = 6383160.

The previous prime is 7978961. The next prime is 7978979. The reversal of 7978975 is 5798797.

It is not a de Polignac number, because 7978975 - 2⁷ = 7978847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159555 + ... + 159604.

Almost surely, 2^7978975 is an apocalyptic number.

7978975 is a deficient number, since it is larger than the sum of its proper divisors (1914985).

7978975 is a wasteful number, since it uses less digits than its factorization.

7978975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319169 (or 319164 counting only the distinct ones).

The product of its digits is 1111320, while the sum is 52.

The square root of 7978975 is about 2824.7079495056. The cubic root of 7978975 is about 199.8246379524.

The spelling of 7978975 in words is "seven million, nine hundred seventy-eight thousand, nine hundred seventy-five".