19478389225 has 27 divisors (see below), whose sum is σ = 24480308439. Its totient is φ = 15374480400.

The previous prime is 19478389223. The next prime is 19478389241. The reversal of 19478389225 is 52298387491.

The square root of 19478389225 is 139565.

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

It can be written as a sum of positive squares in only one way, i.e., 7012220121 + 12466169104 = 83739^2 + 111652^2 .

It is not a de Polignac number, because 19478389225 - 2¹ = 19478389223 is a prime.

It is a super-2 number, since 2×19478389225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19478389225.

It is not an unprimeable number, because it can be changed into a prime (19478389223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 71875840 + ... + 71876110.

Almost surely, 2^19478389225 is an apocalyptic number.

19478389225 is the 139565-th square number.

19478389225 is the 69783-rd centered octagonal number.

It is an amenable number.

19478389225 is a deficient number, since it is larger than the sum of its proper divisors (5001919214).

19478389225 is an frugal number, since it uses more digits than its factorization.

19478389225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 379 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The spelling of 19478389225 in words is "nineteen billion, four hundred seventy-eight million, three hundred eighty-nine thousand, two hundred twenty-five".