1098655 has 4 divisors (see below), whose sum is σ = 1318392. Its totient is φ = 878920.

The previous prime is 1098649. The next prime is 1098667. The reversal of 1098655 is 5568901.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1098655 - 2⁵ = 1098623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1098655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109861 + ... + 109870.

It is an arithmetic number, because the mean of its divisors is an integer number (329598).

2^1098655 is an apocalyptic number.

1098655 is a deficient number, since it is larger than the sum of its proper divisors (219737).

1098655 is an equidigital number, since it uses as much as digits as its factorization.

1098655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219736.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 1098655 is about 1048.1674484547. The cubic root of 1098655 is about 103.1859211509.

The spelling of 1098655 in words is "one million, ninety-eight thousand, six hundred fifty-five".