1123720 has 32 divisors (see below), whose sum is σ = 2724120. Its totient is φ = 414720.

The previous prime is 1123709. The next prime is 1123729. The reversal of 1123720 is 273211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 770884 + 352836 = 878^2 + 594^2 .

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1123694 and 1123703.

It is not an unprimeable number, because it can be changed into a prime (1123729) 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, 561 + ... + 1600.

2^1123720 is an apocalyptic number.

1123720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123720 is an abundant number, since it is smaller than the sum of its proper divisors (1600400).

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

1123720 is a wasteful number, since it uses less digits than its factorization.

1123720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1123720 is about 1060.0566022624. The cubic root of 1123720 is about 103.9647316309.

Adding to 1123720 its reverse (273211), we get a palindrome (1396931).

The spelling of 1123720 in words is "one million, one hundred twenty-three thousand, seven hundred twenty".