1121779 has 16 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 950400.

The previous prime is 1121737. The next prime is 1121819. The reversal of 1121779 is 9771211.

It is a cyclic number.

It is not a de Polignac number, because 1121779 - 2⁷ = 1121651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121179) 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, 7354 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1121779 is an apocalyptic number.

1121779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1121779 is a deficient number, since it is larger than the sum of its proper divisors (191501).

1121779 is a wasteful number, since it uses less digits than its factorization.

1121779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210.

The product of its digits is 882, while the sum is 28.

The square root of 1121779 is about 1059.1406894270. The cubic root of 1121779 is about 103.9048377538.

It can be divided in two parts, 112 and 1779, that added together give a triangular number (1891 = T₆₁).

The spelling of 1121779 in words is "one million, one hundred twenty-one thousand, seven hundred seventy-nine".