1321320 has 192 divisors, whose sum is σ = 5362560. Its totient is φ = 253440.

The previous prime is 1321319. The next prime is 1321349. The reversal of 1321320 is 231231.

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 = 1321296 and 1321305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101634 + ... + 101646.

It is an arithmetic number, because the mean of its divisors is an integer number (27930).

2^1321320 is an apocalyptic number.

1321320 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 1321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681280).

1321320 is an abundant number, since it is smaller than the sum of its proper divisors (4041240).

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

1321320 is a wasteful number, since it uses less digits than its factorization.

1321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 41 counting only the distinct ones).

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

The square root of 1321320 is about 1149.4868420300. The cubic root of 1321320 is about 109.7326842440.

Adding to 1321320 its reverse (231231), we get a palindrome (1552551).

The spelling of 1321320 in words is "one million, three hundred twenty-one thousand, three hundred twenty".