29991998 has 4 divisors (see below), whose sum is σ = 44988000. Its totient is φ = 14995998.

The previous prime is 29991991. The next prime is 29992009. The reversal of 29991998 is 89919992.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29991991) 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 as a sum of consecutive naturals, namely, 7497998 + ... + 7498001.

It is an arithmetic number, because the mean of its divisors is an integer number (11247000).

Almost surely, 2^29991998 is an apocalyptic number.

29991998 is a deficient number, since it is larger than the sum of its proper divisors (14996002).

29991998 is a wasteful number, since it uses less digits than its factorization.

29991998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14996001.

The product of its digits is 944784, while the sum is 56.

The square root of 29991998 is about 5476.4950470168. The cubic root of 29991998 is about 310.6956213892.

The spelling of 29991998 in words is "twenty-nine million, nine hundred ninety-one thousand, nine hundred ninety-eight".