1990004329 has 2 divisors, whose sum is σ = 1990004330. Its totient is φ = 1990004328.

The previous prime is 1990004293. The next prime is 1990004339. The reversal of 1990004329 is 9234000991.

Together with previous prime (1990004293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367002729 + 623001600 = 36973^2 + 24960^2 .

It is an emirp because it is prime and its reverse (9234000991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1990004329 - 2¹⁷ = 1989873257 is a prime.

1990004329 is a modest number, since divided by 4329 gives 1990 as remainder.

It is not a weakly prime, because it can be changed into another prime (1990004339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995002164 + 995002165.

It is an arithmetic number, because the mean of its divisors is an integer number (995002165).

Almost surely, 2^1990004329 is an apocalyptic number.

It is an amenable number.

1990004329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990004329 is an equidigital number, since it uses as much as digits as its factorization.

1990004329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 1990004329 is about 44609.4645675108. The cubic root of 1990004329 is about 1257.8185840187.

The spelling of 1990004329 in words is "one billion, nine hundred ninety million, four thousand, three hundred twenty-nine".