1321087 has 4 divisors (see below), whose sum is σ = 1398816. Its totient is φ = 1243360.

The previous prime is 1321079. The next prime is 1321093. The reversal of 1321087 is 7801231.

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 1321087 - 2³ = 1321079 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38839 + ... + 38872.

It is an arithmetic number, because the mean of its divisors is an integer number (349704).

2^1321087 is an apocalyptic number.

1321087 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1321087 is a deficient number, since it is larger than the sum of its proper divisors (77729).

1321087 is an equidigital number, since it uses as much as digits as its factorization.

1321087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77728.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1321087 is about 1149.3854879891. The cubic root of 1321087 is about 109.7262338211.

The spelling of 1321087 in words is "one million, three hundred twenty-one thousand, eighty-seven".