16442644 has 6 divisors (see below), whose sum is σ = 28774634. Its totient is φ = 8221320.

The previous prime is 16442609. The next prime is 16442659. The reversal of 16442644 is 44624461.

It can be written as a sum of positive squares in only one way, i.e., 14516100 + 1926544 = 3810^2 + 1388^2 .

It is a super-3 number, since 3×16442644³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2055327 + ... + 2055334.

Almost surely, 2^16442644 is an apocalyptic number.

It is an amenable number.

16442644 is a deficient number, since it is larger than the sum of its proper divisors (12331990).

16442644 is a wasteful number, since it uses less digits than its factorization.

16442644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110665 (or 4110663 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 16442644 is about 4054.9530206896. The cubic root of 16442644 is about 254.2868398601.

The spelling of 16442644 in words is "sixteen million, four hundred forty-two thousand, six hundred forty-four".