29920172 has 12 divisors (see below), whose sum is σ = 52991736. Its totient is φ = 14779680.

The previous prime is 29920169. The next prime is 29920183. The reversal of 29920172 is 27102992.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44729 + ... + 45392.

It is an arithmetic number, because the mean of its divisors is an integer number (4415978).

Almost surely, 2^29920172 is an apocalyptic number.

It is an amenable number.

29920172 is a deficient number, since it is larger than the sum of its proper divisors (23071564).

29920172 is a wasteful number, since it uses less digits than its factorization.

29920172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90208 (or 90206 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 29920172 is about 5469.9334548055. The cubic root of 29920172 is about 310.4474011599.

The spelling of 29920172 in words is "twenty-nine million, nine hundred twenty thousand, one hundred seventy-two".