29899891 has 4 divisors (see below), whose sum is σ = 34171312. Its totient is φ = 25628472.

The previous prime is 29899879. The next prime is 29899907. The reversal of 29899891 is 19899892.

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

It is a cyclic number.

It is not a de Polignac number, because 29899891 - 2¹³ = 29891699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29899801) 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 3 ways as a sum of consecutive naturals, for example, 2135700 + ... + 2135713.

It is an arithmetic number, because the mean of its divisors is an integer number (8542828).

Almost surely, 2^29899891 is an apocalyptic number.

29899891 is a deficient number, since it is larger than the sum of its proper divisors (4271421).

29899891 is an equidigital number, since it uses as much as digits as its factorization.

29899891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271420.

The product of its digits is 839808, while the sum is 55.

The square root of 29899891 is about 5468.0792788693. The cubic root of 29899891 is about 310.3772410588.

Subtracting from 29899891 its reverse (19899892), we obtain a palindrome (9999999).

It can be divided in two parts, 2989 and 9891, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 29899891 in words is "twenty-nine million, eight hundred ninety-nine thousand, eight hundred ninety-one".