1814921 has 2 divisors, whose sum is σ = 1814922. Its totient is φ = 1814920.

The previous prime is 1814909. The next prime is 1814927. The reversal of 1814921 is 1294181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 19321 = 1340^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1814921 - 2¹⁰ = 1813897 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (1814927) 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 as a sum of consecutive naturals, namely, 907460 + 907461.

It is an arithmetic number, because the mean of its divisors is an integer number (907461).

2^1814921 is an apocalyptic number.

It is an amenable number.

1814921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814921 is an equidigital number, since it uses as much as digits as its factorization.

1814921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

The square root of 1814921 is about 1347.1900385617. The cubic root of 1814921 is about 121.9792359180.

The spelling of 1814921 in words is "one million, eight hundred fourteen thousand, nine hundred twenty-one".