16442945 has 8 divisors (see below), whose sum is σ = 19841640. Its totient is φ = 13080960.

The previous prime is 16442941. The next prime is 16442947. The reversal of 16442945 is 54924461.

It can be written as a sum of positive squares in 4 ways, for example, as 753424 + 15689521 = 868^2 + 3961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16442945 - 2² = 16442941 is a prime.

It is a super-3 number, since 3×16442945³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16442941) 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 7 ways as a sum of consecutive naturals, for example, 8180 + ... + 9989.

It is an arithmetic number, because the mean of its divisors is an integer number (2480205).

Almost surely, 2^16442945 is an apocalyptic number.

It is an amenable number.

16442945 is a deficient number, since it is larger than the sum of its proper divisors (3398695).

16442945 is a wasteful number, since it uses less digits than its factorization.

16442945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18355.

The product of its digits is 34560, while the sum is 35.

The square root of 16442945 is about 4054.9901356230. The cubic root of 16442945 is about 254.2883915139.

The spelling of 16442945 in words is "sixteen million, four hundred forty-two thousand, nine hundred forty-five".