1321005 has 32 divisors (see below), whose sum is σ = 2525184. Its totient is φ = 576576.

The previous prime is 1320983. The next prime is 1321007. The reversal of 1321005 is 5001231.

It is not a de Polignac number, because 1321005 - 2⁵ = 1320973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2142 + ... + 2688.

It is an arithmetic number, because the mean of its divisors is an integer number (78912).

2^1321005 is an apocalyptic number.

1321005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321005 is a deficient number, since it is larger than the sum of its proper divisors (1204179).

1321005 is a wasteful number, since it uses less digits than its factorization.

1321005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1321005 is about 1149.3498162004. The cubic root of 1321005 is about 109.7239635347.

Adding to 1321005 its reverse (5001231), we get a palindrome (6322236).

The spelling of 1321005 in words is "one million, three hundred twenty-one thousand, five".