16389444 has 12 divisors (see below), whose sum is σ = 38242064. Its totient is φ = 5463144.

The previous prime is 16389431. The next prime is 16389467. The reversal of 16389444 is 44498361.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16389444² = 537227749258272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682882 + ... + 682905.

Almost surely, 2^16389444 is an apocalyptic number.

It is an amenable number.

16389444 is an abundant number, since it is smaller than the sum of its proper divisors (21852620).

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

16389444 is a wasteful number, since it uses less digits than its factorization.

16389444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365794 (or 1365792 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 16389444 is about 4048.3878272715. The cubic root of 16389444 is about 254.0122960960.

The spelling of 16389444 in words is "sixteen million, three hundred eighty-nine thousand, four hundred forty-four".