19401029505 has 48 divisors (see below), whose sum is σ = 39507564096. Its totient is φ = 8682975360.

The previous prime is 19401029497. The next prime is 19401029539. The reversal of 19401029505 is 50592010491.

19401029505 is a `hidden beast` number, since 1 + 9 + 40 + 102 + 9 + 505 = 666.

It is not a de Polignac number, because 19401029505 - 2³ = 19401029497 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19401029505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1501027 + ... + 1513896.

It is an arithmetic number, because the mean of its divisors is an integer number (823074252).

Almost surely, 2^19401029505 is an apocalyptic number.

19401029505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19401029505 is an abundant number, since it is smaller than the sum of its proper divisors (20106534591).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19401029505 is a wasteful number, since it uses less digits than its factorization.

19401029505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014958 (or 3014955 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

Adding to 19401029505 its reverse (50592010491), we get a palindrome (69993039996).

The spelling of 19401029505 in words is "nineteen billion, four hundred one million, twenty-nine thousand, five hundred five".