1321867 has 2 divisors, whose sum is σ = 1321868. Its totient is φ = 1321866.

The previous prime is 1321847. The next prime is 1321891. The reversal of 1321867 is 7681231.

It is a weak prime.

It is an emirp because it is prime and its reverse (7681231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321867 - 2¹⁹ = 797579 is a prime.

It is an Ulam number.

1321867 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1321847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660933 + 660934.

It is an arithmetic number, because the mean of its divisors is an integer number (660934).

2^1321867 is an apocalyptic number.

1321867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321867 is an equidigital number, since it uses as much as digits as its factorization.

1321867 is an evil number, because the sum of its binary digits is even.

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

The square root of 1321867 is about 1149.7247496684. The cubic root of 1321867 is about 109.7478245323.

The spelling of 1321867 in words is "one million, three hundred twenty-one thousand, eight hundred sixty-seven".