26978393 has 4 divisors (see below), whose sum is σ = 29053668. Its totient is φ = 24903120.

The previous prime is 26978389. The next prime is 26978417. The reversal of 26978393 is 39387962.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11042329 + 15936064 = 3323^2 + 3992^2 .

It is a cyclic number.

It is not a de Polignac number, because 26978393 - 2² = 26978389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26978363) 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, 1037618 + ... + 1037643.

It is an arithmetic number, because the mean of its divisors is an integer number (7263417).

Almost surely, 2^26978393 is an apocalyptic number.

It is an amenable number.

26978393 is a deficient number, since it is larger than the sum of its proper divisors (2075275).

26978393 is a wasteful number, since it uses less digits than its factorization.

26978393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075274.

The product of its digits is 489888, while the sum is 47.

The square root of 26978393 is about 5194.0728720340. The cubic root of 26978393 is about 299.9199527174.

The spelling of 26978393 in words is "twenty-six million, nine hundred seventy-eight thousand, three hundred ninety-three".