16978365 has 12 divisors (see below), whose sum is σ = 29429244. Its totient is φ = 9055104.

The previous prime is 16978349. The next prime is 16978373. The reversal of 16978365 is 56387961.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 6827769 = 3186^2 + 2613^2 .

It is not a de Polignac number, because 16978365 - 2⁴ = 16978349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 377297 = 16978365 / (1 + 6 + 9 + 7 + 8 + 3 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 16978365.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188604 + ... + 188693.

It is an arithmetic number, because the mean of its divisors is an integer number (2452437).

Almost surely, 2^16978365 is an apocalyptic number.

16978365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16978365 is a deficient number, since it is larger than the sum of its proper divisors (12450879).

16978365 is a wasteful number, since it uses less digits than its factorization.

16978365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377308 (or 377305 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 16978365 is about 4120.4811612238. The cubic root of 16978365 is about 257.0190349621.

The spelling of 16978365 in words is "sixteen million, nine hundred seventy-eight thousand, three hundred sixty-five".