1098305 has 16 divisors (see below), whose sum is σ = 1447824. Its totient is φ = 794880.

The previous prime is 1098301. The next prime is 1098311. The reversal of 1098305 is 5038901.

It is a Cunningham number, because it is equal to 1048²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 506944 + 591361 = 712^2 + 769^2 .

It is not a de Polignac number, because 1098305 - 2² = 1098301 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1098301) 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, 3827 + ... + 4103.

It is an arithmetic number, because the mean of its divisors is an integer number (90489).

2^1098305 is an apocalyptic number.

It is an amenable number.

1098305 is a deficient number, since it is larger than the sum of its proper divisors (349519).

1098305 is a wasteful number, since it uses less digits than its factorization.

1098305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1098305 is about 1048.0004770991. Note that the first 3 decimals coincide. The cubic root of 1098305 is about 103.1749626280.

The spelling of 1098305 in words is "one million, ninety-eight thousand, three hundred five".