19813888738 has 32 divisors (see below), whose sum is σ = 34063856640. Its totient is φ = 8467411920.

The previous prime is 19813888727. The next prime is 19813888781. The reversal of 19813888738 is 83788831891.

It is a super-3 number, since 3×19813888738³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19813888738.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12611493 + ... + 12613063.

It is an arithmetic number, because the mean of its divisors is an integer number (1064495520).

Almost surely, 2^19813888738 is an apocalyptic number.

19813888738 is a deficient number, since it is larger than the sum of its proper divisors (14249967902).

19813888738 is a wasteful number, since it uses less digits than its factorization.

19813888738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582.

The product of its digits is 18579456, while the sum is 64.

The spelling of 19813888738 in words is "nineteen billion, eight hundred thirteen million, eight hundred eighty-eight thousand, seven hundred thirty-eight".