1111280 has 40 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 428288.

The previous prime is 1111259. The next prime is 1111283. The reversal of 1111280 is 821111.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2081 + ... + 2559.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2^1111280 is an apocalyptic number.

1111280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339200).

1111280 is an abundant number, since it is smaller than the sum of its proper divisors (1567120).

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

1111280 is a wasteful number, since it uses less digits than its factorization.

1111280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1111280 is about 1054.1726613795. The cubic root of 1111280 is about 103.5796643697.

Adding to 1111280 its reverse (821111), we get a palindrome (1932391).

The spelling of 1111280 in words is "one million, one hundred eleven thousand, two hundred eighty".