1224720 has 160 divisors (see below), whose sum is σ = 4880640. Its totient is φ = 279936.

The previous prime is 1224709. The next prime is 1224739. The reversal of 1224720 is 274221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 1224693 and 1224702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174957 + ... + 174963.

It is an arithmetic number, because the mean of its divisors is an integer number (30504).

2^1224720 is an apocalyptic number.

1224720 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 1224720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440320).

1224720 is an abundant number, since it is smaller than the sum of its proper divisors (3655920).

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

1224720 is an frugal number, since it uses more digits than its factorization.

1224720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1224720 is about 1106.6706827236. The cubic root of 1224720 is about 106.9905951497.

Adding to 1224720 its reverse (274221), we get a palindrome (1498941).

The spelling of 1224720 in words is "one million, two hundred twenty-four thousand, seven hundred twenty".