18496978 has 8 divisors (see below), whose sum is σ = 27849420. Its totient is φ = 9213840.

The previous prime is 18496967. The next prime is 18496979. The reversal of 18496978 is 87969481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14265729 + 4231249 = 3777^2 + 2057^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18496979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16653 + ... + 17728.

Almost surely, 2^18496978 is an apocalyptic number.

18496978 is a deficient number, since it is larger than the sum of its proper divisors (9352442).

18496978 is a wasteful number, since it uses less digits than its factorization.

18496978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34652.

The product of its digits is 870912, while the sum is 52.

The square root of 18496978 is about 4300.8113188095. The cubic root of 18496978 is about 264.4642218703.

The spelling of 18496978 in words is "eighteen million, four hundred ninety-six thousand, nine hundred seventy-eight".