1098565 has 8 divisors (see below), whose sum is σ = 1419768. Its totient is φ = 811200.

The previous prime is 1098541. The next prime is 1098593. The reversal of 1098565 is 5658901.

It can be written as a sum of positive squares in 4 ways, for example, as 263169 + 835396 = 513^2 + 914^2 .

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

It is not a de Polignac number, because 1098565 - 2⁵ = 1098533 is a prime.

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

It is a Duffinian number.

1098565 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1098565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8386 + ... + 8515.

It is an arithmetic number, because the mean of its divisors is an integer number (177471).

It is the magic constant of a 130 × 130 magic square.

2^1098565 is an apocalyptic number.

It is an amenable number.

1098565 is a deficient number, since it is larger than the sum of its proper divisors (321203).

1098565 is a wasteful number, since it uses less digits than its factorization.

1098565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16919.

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

The square root of 1098565 is about 1048.1245155038. The cubic root of 1098565 is about 103.1831034673.

It can be divided in two parts, 10985 and 65, that multiplied together give a square (714025 = 845²).

The spelling of 1098565 in words is "one million, ninety-eight thousand, five hundred sixty-five".