1090905 has 8 divisors (see below), whose sum is σ = 1745472. Its totient is φ = 581808.

The previous prime is 1090897. The next prime is 1090909. The reversal of 1090905 is 5090901.

It is a happy number.

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

It is not a de Polignac number, because 1090905 - 2³ = 1090897 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1090909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36349 + ... + 36378.

It is an arithmetic number, because the mean of its divisors is an integer number (218184).

2^1090905 is an apocalyptic number.

1090905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1090905 is a deficient number, since it is larger than the sum of its proper divisors (654567).

1090905 is an equidigital number, since it uses as much as digits as its factorization.

1090905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72735.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 1090905 is about 1044.4639773587. The cubic root of 1090905 is about 102.9427211613.

The spelling of 1090905 in words is "one million, ninety thousand, nine hundred five".