1121778 has 48 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 308448.

The previous prime is 1121737. The next prime is 1121819. The reversal of 1121778 is 8771211.

It is an interprime number because it is at equal distance from previous prime (1121737) and next prime (1121819).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3501 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

2^1121778 is an apocalyptic number.

1121778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441440).

1121778 is an abundant number, since it is smaller than the sum of its proper divisors (1761102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121778 is a wasteful number, since it uses less digits than its factorization.

1121778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its digits is 784, while the sum is 27.

The square root of 1121778 is about 1059.1402173461. The cubic root of 1121778 is about 103.9048068788.

Adding to 1121778 its reverse (8771211), we get a palindrome (9892989).

The spelling of 1121778 in words is "one million, one hundred twenty-one thousand, seven hundred seventy-eight".