7978797 has 16 divisors (see below), whose sum is σ = 12516480. Its totient is φ = 5006016.

The previous prime is 7978793. The next prime is 7978807.

7978797 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7978797 - 2² = 7978793 is a prime.

It is a super-2 number, since 2×7978797² = 127322403134418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8233 + ... + 9150.

It is an arithmetic number, because the mean of its divisors is an integer number (782280).

Almost surely, 2^7978797 is an apocalyptic number.

It is an amenable number.

7978797 is a deficient number, since it is larger than the sum of its proper divisors (4537683).

7978797 is a wasteful number, since it uses less digits than its factorization.

7978797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17409 (or 17403 counting only the distinct ones).

The product of its digits is 1555848, while the sum is 54.

The square root of 7978797 is about 2824.6764416478. The cubic root of 7978797 is about 199.8231520034.

The spelling of 7978797 in words is "seven million, nine hundred seventy-eight thousand, seven hundred ninety-seven".