1098209 has 4 divisors (see below), whose sum is σ = 1255104. Its totient is φ = 941316.

The previous prime is 1098203. The next prime is 1098211. The reversal of 1098209 is 9028901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1098209 - 2⁴ = 1098193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1098203) 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, 78437 + ... + 78450.

It is an arithmetic number, because the mean of its divisors is an integer number (313776).

2^1098209 is an apocalyptic number.

It is an amenable number.

1098209 is a deficient number, since it is larger than the sum of its proper divisors (156895).

1098209 is an equidigital number, since it uses as much as digits as its factorization.

1098209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156894.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1098209 is about 1047.9546745924. The cubic root of 1098209 is about 103.1719564548.

The spelling of 1098209 in words is "one million, ninety-eight thousand, two hundred nine".