16801978 has 8 divisors (see below), whose sum is σ = 25447968. Its totient is φ = 8319324.

The previous prime is 16801963. The next prime is 16801979. The reversal of 16801978 is 87910861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16801978.

It is not an unprimeable number, because it can be changed into a prime (16801979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40576 + ... + 40987.

It is an arithmetic number, because the mean of its divisors is an integer number (3180996).

Almost surely, 2^16801978 is an apocalyptic number.

16801978 is a deficient number, since it is larger than the sum of its proper divisors (8645990).

16801978 is a wasteful number, since it uses less digits than its factorization.

16801978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81668.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 16801978 is about 4099.0215905750. The cubic root of 16801978 is about 256.1258841332.

The spelling of 16801978 in words is "sixteen million, eight hundred one thousand, nine hundred seventy-eight".