1098890 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 396864.

The previous prime is 1098847. The next prime is 1098953. The reversal of 1098890 is 988901.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a zygodrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1098890.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10217 + ... + 10323.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1098890 is an apocalyptic number.

1098890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1098890 is a deficient number, since it is larger than the sum of its proper divisors (1078390).

1098890 is a wasteful number, since it uses less digits than its factorization.

1098890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1098890 is about 1048.2795428701. The cubic root of 1098890 is about 103.1932777105.

The spelling of 1098890 in words is "one million, ninety-eight thousand, eight hundred ninety".