1098605 has 4 divisors (see below), whose sum is σ = 1318332. Its totient is φ = 878880.

The previous prime is 1098593. The next prime is 1098613. The reversal of 1098605 is 5068901.

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 329476 + 769129 = 574^2 + 877^2 .

It is not a de Polignac number, because 1098605 - 2⁶ = 1098541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109856 + ... + 109865.

It is an arithmetic number, because the mean of its divisors is an integer number (329583).

2^1098605 is an apocalyptic number.

It is an amenable number.

1098605 is a deficient number, since it is larger than the sum of its proper divisors (219727).

1098605 is an equidigital number, since it uses as much as digits as its factorization.

1098605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219726.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1098605 is about 1048.1435970324. The cubic root of 1098605 is about 103.1843557902.

The spelling of 1098605 in words is "one million, ninety-eight thousand, six hundred five".