16816378 has 4 divisors (see below), whose sum is σ = 25224570. Its totient is φ = 8408188.

The previous prime is 16816369. The next prime is 16816403. The reversal of 16816378 is 87361861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 2093809 = 3837^2 + 1447^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16816378.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204093 + ... + 4204096.

Almost surely, 2^16816378 is an apocalyptic number.

16816378 is a deficient number, since it is larger than the sum of its proper divisors (8408192).

16816378 is an equidigital number, since it uses as much as digits as its factorization.

16816378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8408191.

The product of its digits is 48384, while the sum is 40.

The square root of 16816378 is about 4100.7777311139. Note that the first 4 decimals coincide. The cubic root of 16816378 is about 256.1990334489.

The spelling of 16816378 in words is "sixteen million, eight hundred sixteen thousand, three hundred seventy-eight".