1098385 has 4 divisors (see below), whose sum is σ = 1318068. Its totient is φ = 878704.

The previous prime is 1098379. The next prime is 1098397. The reversal of 1098385 is 5838901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5838901 = 467 ⋅12503.

It can be written as a sum of positive squares in 2 ways, for example, as 404496 + 693889 = 636^2 + 833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098385 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 1098385.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109834 + ... + 109843.

It is an arithmetic number, because the mean of its divisors is an integer number (329517).

2^1098385 is an apocalyptic number.

It is an amenable number.

1098385 is a deficient number, since it is larger than the sum of its proper divisors (219683).

1098385 is an equidigital number, since it uses as much as digits as its factorization.

1098385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219682.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1098385 is about 1048.0386443257. The cubic root of 1098385 is about 103.1774676385.

The spelling of 1098385 in words is "one million, ninety-eight thousand, three hundred eighty-five".