19947909429 has 24 divisors (see below), whose sum is σ = 34866936000. Its totient is φ = 10728286848.

The previous prime is 19947909413. The next prime is 19947909437. The reversal of 19947909429 is 92490974991.

It is not a de Polignac number, because 19947909429 - 2⁴ = 19947909413 is a prime.

It is a super-3 number, since 3×19947909429³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19947909439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9311679 + ... + 9313820.

It is an arithmetic number, because the mean of its divisors is an integer number (1452789000).

Almost surely, 2^19947909429 is an apocalyptic number.

It is an amenable number.

19947909429 is a deficient number, since it is larger than the sum of its proper divisors (14919026571).

19947909429 is a wasteful number, since it uses less digits than its factorization.

19947909429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18625529 (or 18625526 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 19947909429 in words is "nineteen billion, nine hundred forty-seven million, nine hundred nine thousand, four hundred twenty-nine".