1845881 has 2 divisors, whose sum is σ = 1845882. Its totient is φ = 1845880.

The previous prime is 1845841. The next prime is 1845901. The reversal of 1845881 is 1885481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960400 + 885481 = 980^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1845881 - 2¹⁴ = 1829497 is a prime.

It is a super-2 number, since 2×1845881² = 6814553332322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1845841) 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, 922940 + 922941.

It is an arithmetic number, because the mean of its divisors is an integer number (922941).

2^1845881 is an apocalyptic number.

It is an amenable number.

1845881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1845881 is an equidigital number, since it uses as much as digits as its factorization.

1845881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10240, while the sum is 35.

The square root of 1845881 is about 1358.6320325975. The cubic root of 1845881 is about 122.6689270154.

The spelling of 1845881 in words is "one million, eight hundred forty-five thousand, eight hundred eighty-one".