1321305 has 16 divisors (see below), whose sum is σ = 2151360. Its totient is φ = 692288.

The previous prime is 1321303. The next prime is 1321319. The reversal of 1321305 is 5031231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321305 - 2¹ = 1321303 is a prime.

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

It is an Ulam number.

1321305 is a Rhonda number in base 14.

It is not an unprimeable number, because it can be changed into a prime (1321301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (134460).

2^1321305 is an apocalyptic number.

1321305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321305 is a deficient number, since it is larger than the sum of its proper divisors (830055).

1321305 is a wasteful number, since it uses less digits than its factorization.

1321305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

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

The square root of 1321305 is about 1149.4803173608. The cubic root of 1321305 is about 109.7322690035.

Adding to 1321305 its reverse (5031231), we get a palindrome (6352536).

The spelling of 1321305 in words is "one million, three hundred twenty-one thousand, three hundred five".