16921489 has 8 divisors (see below), whose sum is σ = 18647552. Its totient is φ = 15256080.

The previous prime is 16921447. The next prime is 16921493. The reversal of 16921489 is 98412961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16921489 - 2⁷ = 16921361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16922489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14577 + ... + 15694.

It is an arithmetic number, because the mean of its divisors is an integer number (2330944).

Almost surely, 2^16921489 is an apocalyptic number.

It is an amenable number.

16921489 is a deficient number, since it is larger than the sum of its proper divisors (1726063).

16921489 is a wasteful number, since it uses less digits than its factorization.

16921489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30327.

The product of its digits is 31104, while the sum is 40.

The square root of 16921489 is about 4113.5737504024. The cubic root of 16921489 is about 256.7317169878.

The spelling of 16921489 in words is "sixteen million, nine hundred twenty-one thousand, four hundred eighty-nine".