29993871 has 4 divisors (see below), whose sum is σ = 39991832. Its totient is φ = 19995912.

The previous prime is 29993867. The next prime is 29993881. The reversal of 29993871 is 17839992.

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

It is not a de Polignac number, because 29993871 - 2² = 29993867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29993871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29993881) 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, 4998976 + ... + 4998981.

It is an arithmetic number, because the mean of its divisors is an integer number (9997958).

Almost surely, 2^29993871 is an apocalyptic number.

29993871 is a deficient number, since it is larger than the sum of its proper divisors (9997961).

29993871 is an equidigital number, since it uses as much as digits as its factorization.

29993871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997960.

The product of its digits is 244944, while the sum is 48.

The square root of 29993871 is about 5476.6660478799. Note that the first 3 decimals coincide. The cubic root of 29993871 is about 310.7020889008.

The spelling of 29993871 in words is "twenty-nine million, nine hundred ninety-three thousand, eight hundred seventy-one".