19813888739 has 16 divisors (see below), whose sum is σ = 21499279200. Its totient is φ = 18186608640.

The previous prime is 19813888727. The next prime is 19813888781. The reversal of 19813888739 is 93788831891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19813888739 - 2²⁰ = 19812840163 is a prime.

It is a super-3 number, since 3×19813888739³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19813828739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3142412 + ... + 3148710.

It is an arithmetic number, because the mean of its divisors is an integer number (1343704950).

Almost surely, 2^19813888739 is an apocalyptic number.

19813888739 is a deficient number, since it is larger than the sum of its proper divisors (1685390461).

19813888739 is a wasteful number, since it uses less digits than its factorization.

19813888739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870.

The product of its digits is 20901888, while the sum is 65.

The spelling of 19813888739 in words is "nineteen billion, eight hundred thirteen million, eight hundred eighty-eight thousand, seven hundred thirty-nine".