1098705 has 16 divisors (see below), whose sum is σ = 1779840. Its totient is φ = 578688.

The previous prime is 1098689. The next prime is 1098707. The reversal of 1098705 is 5078901.

It is not a de Polignac number, because 1098705 - 2⁴ = 1098689 is a prime.

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

It is a Curzon number.

1098705 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1098707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (111240).

2^1098705 is an apocalyptic number.

1098705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1098705 is a deficient number, since it is larger than the sum of its proper divisors (681135).

1098705 is an equidigital number, since it uses as much as digits as its factorization.

1098705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1098705 is about 1048.1912993342. The cubic root of 1098705 is about 103.1874864642.

The spelling of 1098705 in words is "one million, ninety-eight thousand, seven hundred five".