1599940409 has 2 divisors, whose sum is σ = 1599940410. Its totient is φ = 1599940408.

The previous prime is 1599940403. The next prime is 1599940423. The reversal of 1599940409 is 9040499951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852464809 + 747475600 = 29197^2 + 27340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1599940409 - 2¹⁶ = 1599874873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1599940403) 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, 799970204 + 799970205.

It is an arithmetic number, because the mean of its divisors is an integer number (799970205).

Almost surely, 2^1599940409 is an apocalyptic number.

It is an amenable number.

1599940409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1599940409 is an equidigital number, since it uses as much as digits as its factorization.

1599940409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 1599940409 is about 39999.2551055642. The cubic root of 1599940409 is about 1169.5925746765.

The spelling of 1599940409 in words is "one billion, five hundred ninety-nine million, nine hundred forty thousand, four hundred nine".