16404444 has 72 divisors (see below), whose sum is σ = 49166208. Its totient is φ = 4685040.

The previous prime is 16404413. The next prime is 16404449. The reversal of 16404444 is 44440461.

It is a Harshad number since it is a multiple of its sum of digits (27).

16404444 is a modest number, since divided by 4444 gives 1640 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5599 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (682864).

Almost surely, 2^16404444 is an apocalyptic number.

16404444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16404444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24583104).

16404444 is an abundant number, since it is smaller than the sum of its proper divisors (32761764).

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

16404444 is a wasteful number, since it uses less digits than its factorization.

16404444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 16404444 is about 4050.2399928893. The cubic root of 16404444 is about 254.0897651190.

It can be divided in two parts, 1640 and 4444, that added together give a square (6084 = 78²).

The spelling of 16404444 in words is "sixteen million, four hundred four thousand, four hundred forty-four".