1089866 has 8 divisors (see below), whose sum is σ = 1640964. Its totient is φ = 542880.

The previous prime is 1089863. The next prime is 1089877. The reversal of 1089866 is 6689801.

It can be written as a sum of positive squares in 2 ways, for example, as 606841 + 483025 = 779^2 + 695^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1089863) by changing a digit.

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, 245 + ... + 1496.

2^1089866 is an apocalyptic number.

1089866 is a deficient number, since it is larger than the sum of its proper divisors (551098).

1089866 is a wasteful number, since it uses less digits than its factorization.

1089866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1089866 is about 1043.9664745575. The cubic root of 1089866 is about 102.9100292033.

The spelling of 1089866 in words is "one million, eighty-nine thousand, eight hundred sixty-six".