1243120 has 40 divisors (see below), whose sum is σ = 2968560. Its totient is φ = 483840.

The previous prime is 1243111. The next prime is 1243129. The reversal of 1243120 is 213421.

It is an interprime number because it is at equal distance from previous prime (1243111) and next prime (1243129).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1243120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3091 + ... + 3469.

It is an arithmetic number, because the mean of its divisors is an integer number (74214).

2^1243120 is an apocalyptic number.

1243120 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 1243120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1484280).

1243120 is an abundant number, since it is smaller than the sum of its proper divisors (1725440).

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

1243120 is a wasteful number, since it uses less digits than its factorization.

1243120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1243120 is about 1114.9529138040. The cubic root of 1243120 is about 107.5237373217.

Adding to 1243120 its reverse (213421), we get a palindrome (1456541).

The spelling of 1243120 in words is "one million, two hundred forty-three thousand, one hundred twenty".