8778397 has 4 divisors (see below), whose sum is σ = 8803900. Its totient is φ = 8752896.

The previous prime is 8778391. The next prime is 8778421. The reversal of 8778397 is 7938778.

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: 7938778 = 2 ⋅3969389.

It can be written as a sum of positive squares in 2 ways, for example, as 5659641 + 3118756 = 2379^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 8778397 - 2³ = 8778389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8778397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8778391) 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, 12228 + ... + 12925.

It is an arithmetic number, because the mean of its divisors is an integer number (2200975).

Almost surely, 2^8778397 is an apocalyptic number.

It is an amenable number.

8778397 is a deficient number, since it is larger than the sum of its proper divisors (25503).

8778397 is a wasteful number, since it uses less digits than its factorization.

8778397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25502.

The product of its digits is 592704, while the sum is 49.

The square root of 8778397 is about 2962.8359725101. The cubic root of 8778397 is about 206.2869426327.

The spelling of 8778397 in words is "eight million, seven hundred seventy-eight thousand, three hundred ninety-seven".