7928197 has 4 divisors (see below), whose sum is σ = 8006796. Its totient is φ = 7849600.

The previous prime is 7928191. The next prime is 7928201. The reversal of 7928197 is 7918297.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7918297 = 251 ⋅31547.

It can be written as a sum of positive squares in 2 ways, for example, as 4879681 + 3048516 = 2209^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928197 - 2³ = 7928189 is a prime.

It is a Duffinian number.

7928197 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7928191) 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 3 ways as a sum of consecutive naturals, for example, 39148 + ... + 39349.

It is an arithmetic number, because the mean of its divisors is an integer number (2001699).

Almost surely, 2^7928197 is an apocalyptic number.

It is an amenable number.

7928197 is a deficient number, since it is larger than the sum of its proper divisors (78599).

7928197 is a wasteful number, since it uses less digits than its factorization.

7928197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78598.

The product of its digits is 63504, while the sum is 43.

The square root of 7928197 is about 2815.7054178305. The cubic root of 7928197 is about 199.3998425231.

The spelling of 7928197 in words is "seven million, nine hundred twenty-eight thousand, one hundred ninety-seven".