16686416 has 10 divisors (see below), whose sum is σ = 32329962. Its totient is φ = 8343200.

The previous prime is 16686409. The next prime is 16686419. The reversal of 16686416 is 61468661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 364816 = 4040^2 + 604^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16686416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521435 + ... + 521466.

Almost surely, 2^16686416 is an apocalyptic number.

16686416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16686416 is a deficient number, since it is larger than the sum of its proper divisors (15643546).

16686416 is a wasteful number, since it uses less digits than its factorization.

16686416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042909 (or 1042903 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 16686416 is about 4084.9009779920. The cubic root of 16686416 is about 255.5373316417.

The spelling of 16686416 in words is "sixteen million, six hundred eighty-six thousand, four hundred sixteen".