16489821 has 8 divisors (see below), whose sum is σ = 22296384. Its totient is φ = 10838240.

The previous prime is 16489819. The next prime is 16489843. The reversal of 16489821 is 12898461.

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 16489821 - 2¹ = 16489819 is a prime.

It is a super-2 number, since 2×16489821² = 543828393224082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16489821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16482821) by changing a digit.

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, 38496 + ... + 38921.

It is an arithmetic number, because the mean of its divisors is an integer number (2787048).

Almost surely, 2^16489821 is an apocalyptic number.

It is an amenable number.

16489821 is a deficient number, since it is larger than the sum of its proper divisors (5806563).

16489821 is an equidigital number, since it uses as much as digits as its factorization.

16489821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77491.

The product of its digits is 27648, while the sum is 39.

The square root of 16489821 is about 4060.7660607329. The cubic root of 16489821 is about 254.5298063626.

The spelling of 16489821 in words is "sixteen million, four hundred eighty-nine thousand, eight hundred twenty-one".