29988981 has 32 divisors (see below), whose sum is σ = 49795200. Its totient is φ = 17677440.

The previous prime is 29988977. The next prime is 29988989. The reversal of 29988981 is 18988992.

It is a happy number.

It is not a de Polignac number, because 29988981 - 2² = 29988977 is a prime.

It is a super-2 number, since 2×29988981² = 1798677962836722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29988989) 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 31 ways as a sum of consecutive naturals, for example, 9625 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (1556100).

Almost surely, 2^29988981 is an apocalyptic number.

It is an amenable number.

29988981 is a deficient number, since it is larger than the sum of its proper divisors (19806219).

29988981 is a wasteful number, since it uses less digits than its factorization.

29988981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786 (or 2780 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 29988981 is about 5476.2195901918. The cubic root of 29988981 is about 310.6852030534.

The spelling of 29988981 in words is "twenty-nine million, nine hundred eighty-eight thousand, nine hundred eighty-one".