16690378 has 4 divisors (see below), whose sum is σ = 25035570. Its totient is φ = 8345188.

The previous prime is 16690363. The next prime is 16690381. The reversal of 16690378 is 87309661.

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., 12938409 + 3751969 = 3597^2 + 1937^2 .

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 16690378.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172593 + ... + 4172596.

Almost surely, 2^16690378 is an apocalyptic number.

16690378 is a deficient number, since it is larger than the sum of its proper divisors (8345192).

16690378 is an equidigital number, since it uses as much as digits as its factorization.

16690378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8345191.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 16690378 is about 4085.3859058845. The cubic root of 16690378 is about 255.5575548538.

The spelling of 16690378 in words is "sixteen million, six hundred ninety thousand, three hundred seventy-eight".