29997971 has 4 divisors (see below), whose sum is σ = 30008952. Its totient is φ = 29986992.

The previous prime is 29997953. The next prime is 29997973. The reversal of 29997971 is 17979992.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 29997971 - 2⁶ = 29997907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29997973) 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, 2180 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (7502238).

Almost surely, 2^29997971 is an apocalyptic number.

29997971 is a deficient number, since it is larger than the sum of its proper divisors (10981).

29997971 is an equidigital number, since it uses as much as digits as its factorization.

29997971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10980.

The product of its digits is 642978, while the sum is 53.

The square root of 29997971 is about 5477.0403504082. The cubic root of 29997971 is about 310.7162453544.

The spelling of 29997971 in words is "twenty-nine million, nine hundred ninety-seven thousand, nine hundred seventy-one".