1213320 has 32 divisors (see below), whose sum is σ = 3640320. Its totient is φ = 323520.

The previous prime is 1213301. The next prime is 1213327. The reversal of 1213320 is 233121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1213296 and 1213305.

It is not an unprimeable number, because it can be changed into a prime (1213327) 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, 4936 + ... + 5175.

It is an arithmetic number, because the mean of its divisors is an integer number (113760).

2^1213320 is an apocalyptic number.

1213320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213320 is an abundant number, since it is smaller than the sum of its proper divisors (2427000).

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

1213320 is a wasteful number, since it uses less digits than its factorization.

1213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10125 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1213320 is about 1101.5080571653. The cubic root of 1213320 is about 106.6575947146.

Adding to 1213320 its reverse (233121), we get a palindrome (1446441).

The spelling of 1213320 in words is "one million, two hundred thirteen thousand, three hundred twenty".