29839394920 has 32 divisors (see below), whose sum is σ = 68776170120. Its totient is φ = 11644641280.

The previous prime is 29839394917. The next prime is 29839394927. The reversal of 29839394920 is 2949393892.

It can be written as a sum of positive squares in 4 ways, for example, as 15871464324 + 13967930596 = 125982^2 + 118186^2 .

It is not an unprimeable number, because it can be changed into a prime (29839394927) 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, 9095737 + ... + 9099016.

Almost surely, 2^29839394920 is an apocalyptic number.

29839394920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29839394920 is an abundant number, since it is smaller than the sum of its proper divisors (38936775200).

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

29839394920 is a wasteful number, since it uses less digits than its factorization.

29839394920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18194805 (or 18194801 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 58.

The spelling of 29839394920 in words is "twenty-nine billion, eight hundred thirty-nine million, three hundred ninety-four thousand, nine hundred twenty".