1867321 has 2 divisors, whose sum is σ = 1867322. Its totient is φ = 1867320.

The previous prime is 1867319. The next prime is 1867337. The reversal of 1867321 is 1237681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 4096 = 1365^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 1867321 - 2¹ = 1867319 is a prime.

Together with 1867319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1867321.

It is not a weakly prime, because it can be changed into another prime (1867351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933660 + 933661.

It is an arithmetic number, because the mean of its divisors is an integer number (933661).

2^1867321 is an apocalyptic number.

It is an amenable number.

1867321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1867321 is an equidigital number, since it uses as much as digits as its factorization.

1867321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 1867321 is about 1366.4995426271. The cubic root of 1867321 is about 123.1420352287.

The spelling of 1867321 in words is "one million, eight hundred sixty-seven thousand, three hundred twenty-one".