1854221 has 2 divisors, whose sum is σ = 1854222. Its totient is φ = 1854220.

The previous prime is 1854211. The next prime is 1854227. The reversal of 1854221 is 1224581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 98596 = 1325^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854221 - 2⁶ = 1854157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1854227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927110 + 927111.

It is an arithmetic number, because the mean of its divisors is an integer number (927111).

2^1854221 is an apocalyptic number.

It is an amenable number.

1854221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1854221 is an equidigital number, since it uses as much as digits as its factorization.

1854221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 1854221 is about 1361.6978372605. The cubic root of 1854221 is about 122.8533957368.

Subtracting from 1854221 its product of digits (640), we obtain a palindrome (1853581).

The spelling of 1854221 in words is "one million, eight hundred fifty-four thousand, two hundred twenty-one".