1121865 has 16 divisors (see below), whose sum is σ = 1857600. Its totient is φ = 577472.

The previous prime is 1121839. The next prime is 1121867. The reversal of 1121865 is 5681211.

It is a cyclic number.

It is not a de Polignac number, because 1121865 - 2⁵ = 1121833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121867) 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, 855 + ... + 1724.

It is an arithmetic number, because the mean of its divisors is an integer number (116100).

2^1121865 is an apocalyptic number.

1121865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121865 is a deficient number, since it is larger than the sum of its proper divisors (735735).

1121865 is a wasteful number, since it uses less digits than its factorization.

1121865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its digits is 480, while the sum is 24.

The square root of 1121865 is about 1059.1812875991. The cubic root of 1121865 is about 103.9074929374.

The spelling of 1121865 in words is "one million, one hundred twenty-one thousand, eight hundred sixty-five".