16643434 has 8 divisors (see below), whose sum is σ = 24992100. Its totient is φ = 8312736.

The previous prime is 16643401. The next prime is 16643447. The reversal of 16643434 is 43434661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16378209 + 265225 = 4047^2 + 515^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16643396 and 16643405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1869 + ... + 6064.

Almost surely, 2^16643434 is an apocalyptic number.

16643434 is a deficient number, since it is larger than the sum of its proper divisors (8348666).

16643434 is a wasteful number, since it uses less digits than its factorization.

16643434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8984.

The product of its digits is 20736, while the sum is 31.

The square root of 16643434 is about 4079.6365034155. The cubic root of 16643434 is about 255.3177328616.

The spelling of 16643434 in words is "sixteen million, six hundred forty-three thousand, four hundred thirty-four".