16791978 has 32 divisors (see below), whose sum is σ = 40052736. Its totient is φ = 4588848.

The previous prime is 16791967. The next prime is 16792021. The reversal of 16791978 is 87919761.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7726 + ... + 9657.

It is an arithmetic number, because the mean of its divisors is an integer number (1251648).

Almost surely, 2^16791978 is an apocalyptic number.

16791978 is an abundant number, since it is smaller than the sum of its proper divisors (23260758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16791978 is a wasteful number, since it uses less digits than its factorization.

16791978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17418.

The product of its digits is 190512, while the sum is 48.

The square root of 16791978 is about 4097.8016057394. The cubic root of 16791978 is about 256.0750614039.

The spelling of 16791978 in words is "sixteen million, seven hundred ninety-one thousand, nine hundred seventy-eight".