1321288 has 8 divisors (see below), whose sum is σ = 2477430. Its totient is φ = 660640.

The previous prime is 1321283. The next prime is 1321289. The reversal of 1321288 is 8821231.

It can be written as a sum of positive squares in only one way, i.e., 1295044 + 26244 = 1138^2 + 162^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1321283) by changing a digit.

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 as a sum of consecutive naturals, namely, 82573 + ... + 82588.

2^1321288 is an apocalyptic number.

It is an amenable number.

1321288 is a deficient number, since it is larger than the sum of its proper divisors (1156142).

1321288 is a wasteful number, since it uses less digits than its factorization.

1321288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165167 (or 165163 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 1321288 is about 1149.4729226911. The cubic root of 1321288 is about 109.7317983939.

The spelling of 1321288 in words is "one million, three hundred twenty-one thousand, two hundred eighty-eight".