29439681 has 8 divisors (see below), whose sum is σ = 40210464. Its totient is φ = 19147680.

The previous prime is 29439673. The next prime is 29439689. The reversal of 29439681 is 18693492.

It is an interprime number because it is at equal distance from previous prime (29439673) and next prime (29439689).

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

It is not a de Polignac number, because 29439681 - 2³ = 29439673 is a prime.

It is a super-2 number, since 2×29439681² = 1733389634763522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (29439689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119551 + ... + 119796.

It is an arithmetic number, because the mean of its divisors is an integer number (5026308).

Almost surely, 2^29439681 is an apocalyptic number.

It is an amenable number.

29439681 is a deficient number, since it is larger than the sum of its proper divisors (10770783).

29439681 is a wasteful number, since it uses less digits than its factorization.

29439681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239391.

The product of its digits is 93312, while the sum is 42.

The square root of 29439681 is about 5425.8345901806. The cubic root of 29439681 is about 308.7765899068.

The spelling of 29439681 in words is "twenty-nine million, four hundred thirty-nine thousand, six hundred eighty-one".