19754138139 has 8 divisors (see below), whose sum is σ = 27725106240. Its totient is φ = 12476297736.

The previous prime is 19754138113. The next prime is 19754138143. The reversal of 19754138139 is 93183145791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19754138139 - 2⁷ = 19754138011 is a prime.

It is a super-3 number, since 3×19754138139³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 19754138091 and 19754138100.

It is not an unprimeable number, because it can be changed into a prime (19754138149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173281857 + ... + 173281970.

It is an arithmetic number, because the mean of its divisors is an integer number (3465638280).

Almost surely, 2^19754138139 is an apocalyptic number.

19754138139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19754138139 is a deficient number, since it is larger than the sum of its proper divisors (7970968101).

19754138139 is a wasteful number, since it uses less digits than its factorization.

19754138139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346563849.

The product of its digits is 816480, while the sum is 51.

The spelling of 19754138139 in words is "nineteen billion, seven hundred fifty-four million, one hundred thirty-eight thousand, one hundred thirty-nine".