18268978 has 16 divisors (see below), whose sum is σ = 33727680. Its totient is φ = 7227216.

The previous prime is 18268967. The next prime is 18268979. The reversal of 18268978 is 87986281.

It is not an unprimeable number, because it can be changed into a prime (18268979) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50008 + ... + 50371.

It is an arithmetic number, because the mean of its divisors is an integer number (2107980).

Almost surely, 2^18268978 is an apocalyptic number.

18268978 is a deficient number, since it is larger than the sum of its proper divisors (15458702).

18268978 is a wasteful number, since it uses less digits than its factorization.

18268978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100401.

The product of its digits is 387072, while the sum is 49.

The square root of 18268978 is about 4274.2225023974. Note that the first 3 decimals coincide. The cubic root of 18268978 is about 263.3731012240.

The spelling of 18268978 in words is "eighteen million, two hundred sixty-eight thousand, nine hundred seventy-eight".