19906429438899 has 24 divisors (see below), whose sum is σ = 28760926970880. Its totient is φ = 13267632437232.

The previous prime is 19906429438897. The next prime is 19906429438991. The reversal of 19906429438899 is 99883492460991.

19906429438899 is a `hidden beast` number, since 1 + 9 + 9 + 0 + 64 + 2 + 94 + 388 + 99 = 666.

It is not a de Polignac number, because 19906429438899 - 2¹ = 19906429438897 is a prime.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19906429438897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1007247592 + ... + 1007267354.

It is an arithmetic number, because the mean of its divisors is an integer number (1198371957120).

Almost surely, 2^{19906429438899} is an apocalyptic number.

19906429438899 is a deficient number, since it is larger than the sum of its proper divisors (8854497531981).

19906429438899 is a wasteful number, since it uses less digits than its factorization.

19906429438899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42111 (or 42108 counting only the distinct ones).

The product of its (nonzero) digits is 2176782336, while the sum is 81.

The spelling of 19906429438899 in words is "nineteen trillion, nine hundred six billion, four hundred twenty-nine million, four hundred thirty-eight thousand, eight hundred ninety-nine".