1210985 has 4 divisors (see below), whose sum is σ = 1453188. Its totient is φ = 968784.

The previous prime is 1210967. The next prime is 1210987. The reversal of 1210985 is 5890121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162409 + 1048576 = 403^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210985 - 2⁶ = 1210921 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121094 + ... + 121103.

It is an arithmetic number, because the mean of its divisors is an integer number (363297).

2^1210985 is an apocalyptic number.

It is an amenable number.

1210985 is a deficient number, since it is larger than the sum of its proper divisors (242203).

1210985 is an equidigital number, since it uses as much as digits as its factorization.

1210985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242202.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1210985 is about 1100.4476361917. The cubic root of 1210985 is about 106.5891309361.

The spelling of 1210985 in words is "one million, two hundred ten thousand, nine hundred eighty-five".