1231120 has 40 divisors (see below), whose sum is σ = 3124800. Its totient is φ = 447360.

The previous prime is 1231099. The next prime is 1231127. The reversal of 1231120 is 211321.

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

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1231097 and 1231106.

It is not an unprimeable number, because it can be changed into a prime (1231127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 181 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (78120).

2^1231120 is an apocalyptic number.

1231120 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 1231120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562400).

1231120 is an abundant number, since it is smaller than the sum of its proper divisors (1893680).

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

1231120 is a wasteful number, since it uses less digits than its factorization.

1231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1417 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1231120 is about 1109.5584707441. The cubic root of 1231120 is about 107.1766378139.

Adding to 1231120 its reverse (211321), we get a palindrome (1442441).

The spelling of 1231120 in words is "one million, two hundred thirty-one thousand, one hundred twenty".