1321387 has 4 divisors (see below), whose sum is σ = 1334320.
Its totient is φ = 1308456.
The previous prime is 1321379. The next prime is 1321391. The reversal of 1321387 is 7831231.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 1321387 - 23 = 1321379 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1321357) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6312 + ... + 6517.
It is an arithmetic number, because the mean of its divisors is an integer number (333580).
21321387 is an apocalyptic number.
1321387 is a deficient number, since it is larger than the sum of its proper divisors (12933).
1321387 is a wasteful number, since it uses less digits than its factorization.
1321387 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 12932.
The product of its digits is 1008, while the sum is 25.
The square root of 1321387 is about 1149.5159850998.
The cubic root of 1321387 is about 109.7345389462.
The spelling of 1321387 in words is "one million, three hundred twenty-one thousand, three hundred eighty-seven".