1090985 has 24 divisors (see below), whose sum is σ = 1569096. Its totient is φ = 725760.

The previous prime is 1090979. The next prime is 1090997. The reversal of 1090985 is 5890901.

It can be written as a sum of positive squares in 4 ways, for example, as 3136 + 1087849 = 56^2 + 1043^2 .

It is not a de Polignac number, because 1090985 - 2¹⁰ = 1089961 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14909 + ... + 14981.

It is an arithmetic number, because the mean of its divisors is an integer number (65379).

2^1090985 is an apocalyptic number.

It is an amenable number.

1090985 is a deficient number, since it is larger than the sum of its proper divisors (478111).

1090985 is an equidigital number, since it uses as much as digits as its factorization.

1090985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 146 counting only the distinct ones).

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

The square root of 1090985 is about 1044.5022738127. The cubic root of 1090985 is about 102.9452374869.

It can be divided in two parts, 109098 and 5, that multiplied together give a triangular number (545490 = T₁₀₄₄).

The spelling of 1090985 in words is "one million, ninety thousand, nine hundred eighty-five".