19489400439 has 24 divisors (see below), whose sum is σ = 27369189120. Its totient is φ = 12332181792.

The previous prime is 19489400431. The next prime is 19489400459. The reversal of 19489400439 is 93400498491.

It is a happy number.

It is not a de Polignac number, because 19489400439 - 2³ = 19489400431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19489400391 and 19489400400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19489400431) 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 in 23 ways as a sum of consecutive naturals, for example, 83394 + ... + 214320.

It is an arithmetic number, because the mean of its divisors is an integer number (1140382880).

Almost surely, 2^19489400439 is an apocalyptic number.

19489400439 is a deficient number, since it is larger than the sum of its proper divisors (7879788681).

19489400439 is a wasteful number, since it uses less digits than its factorization.

19489400439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131047 (or 131018 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 19489400439 in words is "nineteen billion, four hundred eighty-nine million, four hundred thousand, four hundred thirty-nine".