108917393 has 4 divisors (see below), whose sum is σ = 117295668. Its totient is φ = 100539120.

The previous prime is 108917297. The next prime is 108917429. The reversal of 108917393 is 393719801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393719801 = 173 ⋅2275837.

It can be written as a sum of positive squares in 2 ways, for example, as 73479184 + 35438209 = 8572^2 + 5953^2 .

It is a cyclic number.

It is not a de Polignac number, because 108917393 - 2¹⁶ = 108851857 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 108917393.

It is not an unprimeable number, because it can be changed into a prime (108917093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4189118 + ... + 4189143.

It is an arithmetic number, because the mean of its divisors is an integer number (29323917).

Almost surely, 2^108917393 is an apocalyptic number.

108917393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

108917393 is a deficient number, since it is larger than the sum of its proper divisors (8378275).

108917393 is an equidigital number, since it uses as much as digits as its factorization.

108917393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8378274.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 108917393 is about 10436.3496012734. The cubic root of 108917393 is about 477.5649142854.

The spelling of 108917393 in words is "one hundred eight million, nine hundred seventeen thousand, three hundred ninety-three".