1098539 has 4 divisors (see below), whose sum is σ = 1183056. Its totient is φ = 1014024.

The previous prime is 1098533. The next prime is 1098541. The reversal of 1098539 is 9358901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9358901 = 1153 ⋅8117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1098499 and 1098508.

It is not an unprimeable number, because it can be changed into a prime (1098533) 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, 42239 + ... + 42264.

It is an arithmetic number, because the mean of its divisors is an integer number (295764).

2^1098539 is an apocalyptic number.

1098539 is a deficient number, since it is larger than the sum of its proper divisors (84517).

1098539 is an equidigital number, since it uses as much as digits as its factorization.

1098539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84516.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1098539 is about 1048.1121123239. The cubic root of 1098539 is about 103.1822894412.

The spelling of 1098539 in words is "one million, ninety-eight thousand, five hundred thirty-nine".