16949778 has 16 divisors (see below), whose sum is σ = 33987360. Its totient is φ = 5635296.

The previous prime is 16949773. The next prime is 16949789. The reversal of 16949778 is 87794961.

It is a self number, because there is not a number n which added to its sum of digits gives 16949778.

It is not an unprimeable number, because it can be changed into a prime (16949773) 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 7 ways as a sum of consecutive naturals, for example, 1000 + ... + 5907.

It is an arithmetic number, because the mean of its divisors is an integer number (2124210).

Almost surely, 2^16949778 is an apocalyptic number.

16949778 is an abundant number, since it is smaller than the sum of its proper divisors (17037582).

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

16949778 is a wasteful number, since it uses less digits than its factorization.

16949778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321.

The product of its digits is 762048, while the sum is 51.

The square root of 16949778 is about 4117.0108088272. The cubic root of 16949778 is about 256.8747036185.

The spelling of 16949778 in words is "sixteen million, nine hundred forty-nine thousand, seven hundred seventy-eight".