1221140 has 12 divisors (see below), whose sum is σ = 2564436. Its totient is φ = 488448.

The previous prime is 1221131. The next prime is 1221163. The reversal of 1221140 is 411221.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 414736 = 898^2 + 644^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30509 + ... + 30548.

It is an arithmetic number, because the mean of its divisors is an integer number (213703).

2^1221140 is an apocalyptic number.

1221140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221140 is an abundant number, since it is smaller than the sum of its proper divisors (1343296).

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

1221140 is a wasteful number, since it uses less digits than its factorization.

1221140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61066 (or 61064 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221140 is about 1105.0520349739. The cubic root of 1221140 is about 106.8862447273.

Adding to 1221140 its reverse (411221), we get a palindrome (1632361).

The spelling of 1221140 in words is "one million, two hundred twenty-one thousand, one hundred forty".