1321287 has 8 divisors (see below), whose sum is σ = 1921920. Its totient is φ = 800760.

The previous prime is 1321283. The next prime is 1321289. The reversal of 1321287 is 7821231.

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

It is not a de Polignac number, because 1321287 - 2² = 1321283 is a prime.

1321287 is a lucky number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19987 + ... + 20052.

It is an arithmetic number, because the mean of its divisors is an integer number (240240).

2^1321287 is an apocalyptic number.

1321287 is a deficient number, since it is larger than the sum of its proper divisors (600633).

1321287 is a wasteful number, since it uses less digits than its factorization.

1321287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40053.

The product of its digits is 672, while the sum is 24.

The square root of 1321287 is about 1149.4724877090. The cubic root of 1321287 is about 109.7317707109.

The spelling of 1321287 in words is "one million, three hundred twenty-one thousand, two hundred eighty-seven".