29999980 has 24 divisors (see below), whose sum is σ = 63307440. Its totient is φ = 11941440.

The previous prime is 29999947. The next prime is 29999989. The reversal of 29999980 is 8999992.

It is not an unprimeable number, because it can be changed into a prime (29999989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 666 + ... + 7774.

It is an arithmetic number, because the mean of its divisors is an integer number (2637810).

Almost surely, 2^29999980 is an apocalyptic number.

29999980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29999980 is an abundant number, since it is smaller than the sum of its proper divisors (33307460).

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

29999980 is a wasteful number, since it uses less digits than its factorization.

29999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7329 (or 7327 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 29999980 is about 5477.2237493095. The cubic root of 29999980 is about 310.7231815458.

The spelling of 29999980 in words is "twenty-nine million, nine hundred ninety-nine thousand, nine hundred eighty".