1321718 has 16 divisors (see below), whose sum is σ = 2108160. Its totient is φ = 620136.

The previous prime is 1321711. The next prime is 1321729. The reversal of 1321718 is 8171231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1321693 and 1321702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2471 + ... + 2957.

It is an arithmetic number, because the mean of its divisors is an integer number (131760).

2^1321718 is an apocalyptic number.

1321718 is a deficient number, since it is larger than the sum of its proper divisors (786442).

1321718 is a wasteful number, since it uses less digits than its factorization.

1321718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

The product of its digits is 336, while the sum is 23.

The square root of 1321718 is about 1149.6599497243. The cubic root of 1321718 is about 109.7437008092.

Adding to 1321718 its reverse (8171231), we get a palindrome (9492949).

The spelling of 1321718 in words is "one million, three hundred twenty-one thousand, seven hundred eighteen".