1321530 has 96 divisors (see below), whose sum is σ = 3939840. Its totient is φ = 282240.

The previous prime is 1321517. The next prime is 1321549. The reversal of 1321530 is 351231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

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, 42615 + ... + 42645.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2^1321530 is an apocalyptic number.

1321530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1969920).

1321530 is an abundant number, since it is smaller than the sum of its proper divisors (2618310).

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

1321530 is a wasteful number, since it uses less digits than its factorization.

1321530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1321530 is about 1149.5781835091. The cubic root of 1321530 is about 109.7384972802.

Adding to 1321530 its reverse (351231), we get a palindrome (1672761).

Subtracting from 1321530 its reverse (351231), we obtain a cube (970299 = 99³).

The spelling of 1321530 in words is "one million, three hundred twenty-one thousand, five hundred thirty".