7978235 has 4 divisors (see below), whose sum is σ = 9573888. Its totient is φ = 6382584.

The previous prime is 7978211. The next prime is 7978237. The reversal of 7978235 is 5328797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5328797 = 19 ⋅280463.

It is a cyclic number.

It is not a de Polignac number, because 7978235 - 2¹⁶ = 7912699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7978192 and 7978201.

It is not an unprimeable number, because it can be changed into a prime (7978237) 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 3 ways as a sum of consecutive naturals, for example, 797819 + ... + 797828.

It is an arithmetic number, because the mean of its divisors is an integer number (2393472).

Almost surely, 2^7978235 is an apocalyptic number.

7978235 is a deficient number, since it is larger than the sum of its proper divisors (1595653).

7978235 is a wasteful number, since it uses less digits than its factorization.

7978235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595652.

The product of its digits is 105840, while the sum is 41.

The square root of 7978235 is about 2824.5769594755. The cubic root of 7978235 is about 199.8184602665.

The spelling of 7978235 in words is "seven million, nine hundred seventy-eight thousand, two hundred thirty-five".