1091906 has 8 divisors (see below), whose sum is σ = 1668924. Its totient is φ = 535600.

The previous prime is 1091887. The next prime is 1091917. The reversal of 1091906 is 6091901.

It can be written as a sum of positive squares in 2 ways, for example, as 919681 + 172225 = 959^2 + 415^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 5045 + ... + 5256.

2^1091906 is an apocalyptic number.

1091906 is a deficient number, since it is larger than the sum of its proper divisors (577018).

1091906 is a wasteful number, since it uses less digits than its factorization.

1091906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1091906 is about 1044.9430606497. The cubic root of 1091906 is about 102.9741978289.

The spelling of 1091906 in words is "one million, ninety-one thousand, nine hundred six".