7979797 has 6 divisors (see below), whose sum is σ = 9282678. Its totient is φ = 6839784.

The previous prime is 7979779. The next prime is 7979813.

7979797 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 2414916 = 2359^2 + 1554^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7979797 is a prime.

It is a super-2 number, since 2×7979797² = 127354320322418, which contains 22 as substring.

It is a Duffinian number.

7979797 is an undulating number in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7979717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81378 + ... + 81475.

It is an arithmetic number, because the mean of its divisors is an integer number (1547113).

Almost surely, 2^7979797 is an apocalyptic number.

It is an amenable number.

7979797 is a deficient number, since it is larger than the sum of its proper divisors (1302881).

7979797 is a wasteful number, since it uses less digits than its factorization.

7979797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162867 (or 162860 counting only the distinct ones).

The product of its digits is 1750329, while the sum is 55.

The square root of 7979797 is about 2824.8534475261. The cubic root of 7979797 is about 199.8314997449.

The spelling of 7979797 in words is "seven million, nine hundred seventy-nine thousand, seven hundred ninety-seven".