16921280 has 28 divisors (see below), whose sum is σ = 40294560. Its totient is φ = 6768384.

The previous prime is 16921279. The next prime is 16921291. The reversal of 16921280 is 8212961.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26120 + ... + 26759.

Almost surely, 2^16921280 is an apocalyptic number.

16921280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16921280 is an abundant number, since it is smaller than the sum of its proper divisors (23373280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16921280 is an equidigital number, since it uses as much as digits as its factorization.

16921280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52896 (or 52886 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16921280 is about 4113.5483466224. The cubic root of 16921280 is about 256.7306600054.

The spelling of 16921280 in words is "sixteen million, nine hundred twenty-one thousand, two hundred eighty".