1090825 has 6 divisors (see below), whose sum is σ = 1352654. Its totient is φ = 872640.

The previous prime is 1090819. The next prime is 1090841. The reversal of 1090825 is 5280901.

It can be written as a sum of positive squares in 3 ways, for example, as 259081 + 831744 = 509^2 + 912^2 .

It is not a de Polignac number, because 1090825 - 2⁷ = 1090697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 43633 = 1090825 / (1 + 0 + 9 + 0 + 8 + 2 + 5).

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 1090825.

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 5 ways as a sum of consecutive naturals, for example, 21792 + ... + 21841.

2^1090825 is an apocalyptic number.

It is an amenable number.

1090825 is a deficient number, since it is larger than the sum of its proper divisors (261829).

1090825 is an equidigital number, since it uses as much as digits as its factorization.

1090825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43643 (or 43638 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1090825 is about 1044.4256795005. The cubic root of 1090825 is about 102.9402047127.

The spelling of 1090825 in words is "one million, ninety thousand, eight hundred twenty-five".