1840512409 has 2 divisors, whose sum is σ = 1840512410. Its totient is φ = 1840512408.

The previous prime is 1840512391. The next prime is 1840512419. The reversal of 1840512409 is 9042150481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1434288384 + 406224025 = 37872^2 + 20155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840512409 - 2¹⁷ = 1840381337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840512419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920256204 + 920256205.

It is an arithmetic number, because the mean of its divisors is an integer number (920256205).

Almost surely, 2^1840512409 is an apocalyptic number.

It is an amenable number.

1840512409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840512409 is an equidigital number, since it uses as much as digits as its factorization.

1840512409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1840512409 is about 42901.1935614850. The cubic root of 1840512409 is about 1225.4988741932.

The spelling of 1840512409 in words is "one billion, eight hundred forty million, five hundred twelve thousand, four hundred nine".