16921875 has 42 divisors (see below), whose sum is σ = 29765244. Its totient is φ = 8550000.

The previous prime is 16921867. The next prime is 16921901. The reversal of 16921875 is 57812961.

It is not a de Polignac number, because 16921875 - 2³ = 16921867 is a prime.

Its product of digits (30240) is a multiple of the sum of its prime divisors (27).

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 890616 + ... + 890634.

Almost surely, 2^16921875 is an apocalyptic number.

16921875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16921875 is a deficient number, since it is larger than the sum of its proper divisors (12843369).

16921875 is an frugal number, since it uses more digits than its factorization.

16921875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 27 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 16921875 is about 4113.6206679761. The cubic root of 16921875 is about 256.7336690952.

The spelling of 16921875 in words is "sixteen million, nine hundred twenty-one thousand, eight hundred seventy-five".