16381944 has 72 divisors (see below), whose sum is σ = 45771960. Its totient is φ = 5292576.

The previous prime is 16381891. The next prime is 16381961. The reversal of 16381944 is 44918361.

16381944 is a `hidden beast` number, since 1 + 638 + 19 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16381899 and 16381908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 158997 + ... + 159099.

Almost surely, 2^16381944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16381944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22885980).

16381944 is an abundant number, since it is smaller than the sum of its proper divisors (29390016).

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

16381944 is a wasteful number, since it uses less digits than its factorization.

16381944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 155 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 16381944 is about 4047.4614266229. The cubic root of 16381944 is about 253.9735438582.

The spelling of 16381944 in words is "sixteen million, three hundred eighty-one thousand, nine hundred forty-four".