7778397 has 16 divisors (see below), whose sum is σ = 11592000. Its totient is φ = 4598400.

The previous prime is 7778389. The next prime is 7778413. The reversal of 7778397 is 7938777.

It is not a de Polignac number, because 7778397 - 2³ = 7778389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778317) 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 15 ways as a sum of consecutive naturals, for example, 1522 + ... + 4227.

It is an arithmetic number, because the mean of its divisors is an integer number (724500).

Almost surely, 2^7778397 is an apocalyptic number.

It is an amenable number.

7778397 is a deficient number, since it is larger than the sum of its proper divisors (3813603).

7778397 is a wasteful number, since it uses less digits than its factorization.

7778397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804.

The product of its digits is 518616, while the sum is 48.

The square root of 7778397 is about 2788.9777697214. The cubic root of 7778397 is about 198.1359896315.

The spelling of 7778397 in words is "seven million, seven hundred seventy-eight thousand, three hundred ninety-seven".