29989381891 has 8 divisors (see below), whose sum is σ = 34707422720. Its totient is φ = 25379801928.

The previous prime is 29989381843. The next prime is 29989381897. The reversal of 29989381891 is 19818398992.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29989381891 - 2⁹ = 29989381379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29989381897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27114621 + ... + 27115726.

It is an arithmetic number, because the mean of its divisors is an integer number (4338427840).

Almost surely, 2^29989381891 is an apocalyptic number.

29989381891 is a deficient number, since it is larger than the sum of its proper divisors (4718040829).

29989381891 is an equidigital number, since it uses as much as digits as its factorization.

29989381891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54230433.

The product of its digits is 20155392, while the sum is 67.

The spelling of 29989381891 in words is "twenty-nine billion, nine hundred eighty-nine million, three hundred eighty-one thousand, eight hundred ninety-one".