29439985 has 16 divisors (see below), whose sum is σ = 36105552. Its totient is φ = 23040000.

The previous prime is 29439979. The next prime is 29439989. The reversal of 29439985 is 58993492.

It can be written as a sum of positive squares in 8 ways, for example, as 4129024 + 25310961 = 2032^2 + 5031^2 .

It is not a de Polignac number, because 29439985 - 2⁵ = 29439953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29439989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48685 + ... + 49285.

It is an arithmetic number, because the mean of its divisors is an integer number (2256597).

Almost surely, 2^29439985 is an apocalyptic number.

It is an amenable number.

29439985 is a deficient number, since it is larger than the sum of its proper divisors (6665567).

29439985 is a wasteful number, since it uses less digits than its factorization.

29439985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its digits is 699840, while the sum is 49.

The square root of 29439985 is about 5425.8626042317. The cubic root of 29439985 is about 308.7776527326. Note that the first 3 decimals are identical.

The spelling of 29439985 in words is "twenty-nine million, four hundred thirty-nine thousand, nine hundred eighty-five".