1122780 has 24 divisors (see below), whose sum is σ = 3143952. Its totient is φ = 299392.

The previous prime is 1122761. The next prime is 1122811. The reversal of 1122780 is 872211.

1122780 = T₄₉₅ + T₄₉₆ + ... + T₅₀₃.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9297 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (130998).

2^1122780 is an apocalyptic number.

1122780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122780 is an abundant number, since it is smaller than the sum of its proper divisors (2021172).

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

1122780 is a wasteful number, since it uses less digits than its factorization.

1122780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18725 (or 18723 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1122780 is about 1059.6131369514. The cubic root of 1122780 is about 103.9357344578.

Adding to 1122780 its reverse (872211), we get a palindrome (1994991).

It can be divided in two parts, 11 and 22780, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 1122780 in words is "one million, one hundred twenty-two thousand, seven hundred eighty".