1098665 has 8 divisors (see below), whose sum is σ = 1364040. Its totient is φ = 848512.

The previous prime is 1098649. The next prime is 1098667. The reversal of 1098665 is 5668901.

It can be written as a sum of positive squares in 4 ways, for example, as 361 + 1098304 = 19^2 + 1048^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1098665 - 2⁴ = 1098649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1098667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3644 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (170505).

2^1098665 is an apocalyptic number.

It is an amenable number.

1098665 is a deficient number, since it is larger than the sum of its proper divisors (265375).

1098665 is an equidigital number, since it uses as much as digits as its factorization.

1098665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1098665 is about 1048.1722186740. The cubic root of 1098665 is about 103.1862342174.

The spelling of 1098665 in words is "one million, ninety-eight thousand, six hundred sixty-five".