921928172 has 24 divisors (see below), whose sum is σ = 1765117200. Its totient is φ = 417850560.

The previous prime is 921928153. The next prime is 921928199. The reversal of 921928172 is 271829129.

It is a super-3 number, since 3×921928172³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14663 + ... + 45374.

It is an arithmetic number, because the mean of its divisors is an integer number (73546550).

Almost surely, 2^921928172 is an apocalyptic number.

It is an amenable number.

921928172 is a deficient number, since it is larger than the sum of its proper divisors (843189028).

921928172 is a wasteful number, since it uses less digits than its factorization.

921928172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60401 (or 60399 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 921928172 is about 30363.2701137410. The cubic root of 921928172 is about 973.2678153288.

The spelling of 921928172 in words is "nine hundred twenty-one million, nine hundred twenty-eight thousand, one hundred seventy-two".