1321730 has 8 divisors (see below), whose sum is σ = 2379132. Its totient is φ = 528688.

The previous prime is 1321729. The next prime is 1321753. The reversal of 1321730 is 371231.

It can be written as a sum of positive squares in 2 ways, for example, as 1274641 + 47089 = 1129^2 + 217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1321699 and 1321708.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 66077 + ... + 66096.

2^1321730 is an apocalyptic number.

1321730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321730 is a deficient number, since it is larger than the sum of its proper divisors (1057402).

1321730 is a wasteful number, since it uses less digits than its factorization.

1321730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132180.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 1321730 is about 1149.6651686469. The cubic root of 1321730 is about 109.7440329326.

Adding to 1321730 its reverse (371231), we get a palindrome (1692961).

The spelling of 1321730 in words is "one million, three hundred twenty-one thousand, seven hundred thirty".