1852440209 has 2 divisors, whose sum is σ = 1852440210. Its totient is φ = 1852440208.

The previous prime is 1852440203. The next prime is 1852440251. The reversal of 1852440209 is 9020442581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1802427025 + 50013184 = 42455^2 + 7072^2 .

It is an emirp because it is prime and its reverse (9020442581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1852440209 - 2²⁸ = 1584004753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1852440203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 926220104 + 926220105.

It is an arithmetic number, because the mean of its divisors is an integer number (926220105).

Almost surely, 2^1852440209 is an apocalyptic number.

It is an amenable number.

1852440209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1852440209 is an equidigital number, since it uses as much as digits as its factorization.

1852440209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1852440209 is about 43039.9838406103. The cubic root of 1852440209 is about 1228.1405373522.

The spelling of 1852440209 in words is "one billion, eight hundred fifty-two million, four hundred forty thousand, two hundred nine".