29439991 has 4 divisors (see below), whose sum is σ = 33645712. Its totient is φ = 25234272.

The previous prime is 29439989. The next prime is 29440007. The reversal of 29439991 is 19993492.

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

It is not a de Polignac number, because 29439991 - 2¹ = 29439989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29439961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2102850 + ... + 2102863.

It is an arithmetic number, because the mean of its divisors is an integer number (8411428).

Almost surely, 2^29439991 is an apocalyptic number.

29439991 is a deficient number, since it is larger than the sum of its proper divisors (4205721).

29439991 is an equidigital number, since it uses as much as digits as its factorization.

29439991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4205720.

The product of its digits is 157464, while the sum is 46.

The square root of 29439991 is about 5425.8631571391. The cubic root of 29439991 is about 308.7776737093. Note that the first 3 decimals are identical.

The spelling of 29439991 in words is "twenty-nine million, four hundred thirty-nine thousand, nine hundred ninety-one".