16651984 has 10 divisors (see below), whose sum is σ = 32263250. Its totient is φ = 8325984.

The previous prime is 16651981. The next prime is 16651997. The reversal of 16651984 is 48915661.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 3168400 = 3672^2 + 1780^2 .

It is a super-2 number, since 2×16651984² = 554577142272512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16651981) 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 as a sum of consecutive naturals, namely, 520359 + ... + 520390.

It is an arithmetic number, because the mean of its divisors is an integer number (3226325).

Almost surely, 2^16651984 is an apocalyptic number.

It is an amenable number.

16651984 is a deficient number, since it is larger than the sum of its proper divisors (15611266).

16651984 is a wasteful number, since it uses less digits than its factorization.

16651984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040757 (or 1040751 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 16651984 is about 4080.6842563472. The cubic root of 16651984 is about 255.3614456538.

The spelling of 16651984 in words is "sixteen million, six hundred fifty-one thousand, nine hundred eighty-four".