19890412385 has 4 divisors (see below), whose sum is σ = 23868494868. Its totient is φ = 15912329904.

The previous prime is 19890412357. The next prime is 19890412393. The reversal of 19890412385 is 58321409891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58321409891 = 19 ⋅3069547889.

It can be written as a sum of positive squares in 2 ways, for example, as 10291899601 + 9598512784 = 101449^2 + 97972^2 .

It is a cyclic number.

It is not a de Polignac number, because 19890412385 - 2¹⁶ = 19890346849 is a prime.

It is a super-2 number, since 2×19890412385² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1989041234 + ... + 1989041243.

It is an arithmetic number, because the mean of its divisors is an integer number (5967123717).

Almost surely, 2^19890412385 is an apocalyptic number.

It is an amenable number.

19890412385 is a deficient number, since it is larger than the sum of its proper divisors (3978082483).

19890412385 is an equidigital number, since it uses as much as digits as its factorization.

19890412385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978082482.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 19890412385 in words is "nineteen billion, eight hundred ninety million, four hundred twelve thousand, three hundred eighty-five".