29981686 has 8 divisors (see below), whose sum is σ = 51397200. Its totient is φ = 12849288.

The previous prime is 29981671. The next prime is 29981711. The reversal of 29981686 is 68618992.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070761 + ... + 1070788.

It is an arithmetic number, because the mean of its divisors is an integer number (6424650).

Almost surely, 2^29981686 is an apocalyptic number.

29981686 is a deficient number, since it is larger than the sum of its proper divisors (21415514).

29981686 is a wasteful number, since it uses less digits than its factorization.

29981686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141558.

The product of its digits is 373248, while the sum is 49.

The square root of 29981686 is about 5475.5534880047. The cubic root of 29981686 is about 310.6600089957.

The spelling of 29981686 in words is "twenty-nine million, nine hundred eighty-one thousand, six hundred eighty-six".