19890039030625 has 15 divisors (see below), whose sum is σ = 24854732098383. Its totient is φ = 15911942028000.

The previous prime is 19890039030619. The next prime is 19890039030733. The reversal of 19890039030625 is 52603093009891.

It is a happy number.

The square root of 19890039030625 is 4459825.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 8802098049889 + 11087940980736 = 2966833^2 + 3329856^2 .

It is not a de Polignac number, because 19890039030625 - 2¹⁹ = 19890038506337 is a prime.

It is a super-2 number, since 2×19890039030625² (a number of 27 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 14 ways as a sum of consecutive naturals, for example, 111406429 + ... + 111584821.

Almost surely, 2^{19890039030625} is an apocalyptic number.

19890039030625 is the 4459825-th square number.

19890039030625 is the 2229913-rd centered octagonal number.

It is an amenable number.

19890039030625 is a deficient number, since it is larger than the sum of its proper divisors (4964693067758).

19890039030625 is an frugal number, since it uses more digits than its factorization.

19890039030625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356806 (or 178398 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 19890039030625 in words is "nineteen trillion, eight hundred ninety billion, thirty-nine million, thirty thousand, six hundred twenty-five".