16978441 has 4 divisors (see below), whose sum is σ = 17169300. Its totient is φ = 16787584.

The previous prime is 16978411. The next prime is 16978459. The reversal of 16978441 is 14487961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14487961 = 17 ⋅852233.

It can be written as a sum of positive squares in 2 ways, for example, as 6610041 + 10368400 = 2571^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 16978441 - 2⁹ = 16977929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16978394 and 16978403.

It is not an unprimeable number, because it can be changed into a prime (16978411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95296 + ... + 95473.

It is an arithmetic number, because the mean of its divisors is an integer number (4292325).

Almost surely, 2^16978441 is an apocalyptic number.

It is an amenable number.

16978441 is a deficient number, since it is larger than the sum of its proper divisors (190859).

16978441 is an equidigital number, since it uses as much as digits as its factorization.

16978441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190858.

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

The square root of 16978441 is about 4120.4903834374. The cubic root of 16978441 is about 257.0194184583.

The spelling of 16978441 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred forty-one".