1089905 has 4 divisors (see below), whose sum is σ = 1307892. Its totient is φ = 871920.

The previous prime is 1089877. The next prime is 1089917. The reversal of 1089905 is 5099801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 937024 = 391^2 + 968^2 .

It is not a de Polignac number, because 1089905 - 2⁶ = 1089841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108986 + ... + 108995.

It is an arithmetic number, because the mean of its divisors is an integer number (326973).

2^1089905 is an apocalyptic number.

It is an amenable number.

1089905 is a deficient number, since it is larger than the sum of its proper divisors (217987).

1089905 is an equidigital number, since it uses as much as digits as its factorization.

1089905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217986.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1089905 is about 1043.9851531511. The cubic root of 1089905 is about 102.9112567068.

The spelling of 1089905 in words is "one million, eighty-nine thousand, nine hundred five".