1089890 has 16 divisors (see below), whose sum is σ = 1990008. Its totient is φ = 429696.

The previous prime is 1089877. The next prime is 1089917. The reversal of 1089890 is 989801.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1038361 + 51529 = 1019^2 + 227^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1089890.

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 7 ways as a sum of consecutive naturals, for example, 17 + ... + 1476.

2^1089890 is an apocalyptic number.

1089890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1089890 is a deficient number, since it is larger than the sum of its proper divisors (900118).

1089890 is a wasteful number, since it uses less digits than its factorization.

1089890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1089890 is about 1043.9779691162. The cubic root of 1089890 is about 102.9107845936.

The spelling of 1089890 in words is "one million, eighty-nine thousand, eight hundred ninety".