16651944 has 24 divisors (see below), whose sum is σ = 45099210. Its totient is φ = 5550624.

The previous prime is 16651937. The next prime is 16651949. The reversal of 16651944 is 44915661.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 152100 = 4062^2 + 390^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 16651899 and 16651908.

It is not an unprimeable number, because it can be changed into a prime (16651949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115567 + ... + 115710.

Almost surely, 2^16651944 is an apocalyptic number.

It is an amenable number.

16651944 is an abundant number, since it is smaller than the sum of its proper divisors (28447266).

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

16651944 is a wasteful number, since it uses less digits than its factorization.

16651944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231289 (or 231282 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 16651944 is about 4080.6793552055. The cubic root of 16651944 is about 255.3612411843.

The spelling of 16651944 in words is "sixteen million, six hundred fifty-one thousand, nine hundred forty-four".