19439939225 has 48 divisors (see below), whose sum is σ = 27865109376. Its totient is φ = 13177920000.

The previous prime is 19439939131. The next prime is 19439939291. The reversal of 19439939225 is 52293993491.

It is a happy number.

It is not a de Polignac number, because 19439939225 - 2²⁰ = 19438890649 is a prime.

It is a super-2 number, since 2×19439939225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 13125485 + ... + 13126965.

It is an arithmetic number, because the mean of its divisors is an integer number (580523112).

Almost surely, 2^19439939225 is an apocalyptic number.

It is an amenable number.

19439939225 is a deficient number, since it is larger than the sum of its proper divisors (8425170151).

19439939225 is a wasteful number, since it uses less digits than its factorization.

19439939225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2301 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 56.

The spelling of 19439939225 in words is "nineteen billion, four hundred thirty-nine million, nine hundred thirty-nine thousand, two hundred twenty-five".