1121985 has 16 divisors (see below), whose sum is σ = 1994880. Its totient is φ = 598320.

The previous prime is 1121947. The next prime is 1121987. The reversal of 1121985 is 5891211.

It is not a de Polignac number, because 1121985 - 2¹⁰ = 1120961 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1121987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4021 + ... + 4290.

It is an arithmetic number, because the mean of its divisors is an integer number (124680).

2^1121985 is an apocalyptic number.

1121985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121985 is a deficient number, since it is larger than the sum of its proper divisors (872895).

1121985 is an equidigital number, since it uses as much as digits as its factorization.

1121985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8325 (or 8319 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1121985 is about 1059.2379336108. The cubic root of 1121985 is about 103.9111976181.

The spelling of 1121985 in words is "one million, one hundred twenty-one thousand, nine hundred eighty-five".