18678378 has 16 divisors (see below), whose sum is σ = 38645280. Its totient is φ = 6011376.

The previous prime is 18678367. The next prime is 18678389. The reversal of 18678378 is 87387681.

It is an interprime number because it is at equal distance from previous prime (18678367) and next prime (18678389).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53500 + ... + 53847.

It is an arithmetic number, because the mean of its divisors is an integer number (2415330).

Almost surely, 2^18678378 is an apocalyptic number.

18678378 is an abundant number, since it is smaller than the sum of its proper divisors (19966902).

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

18678378 is a wasteful number, since it uses less digits than its factorization.

18678378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107381.

The product of its digits is 451584, while the sum is 48.

The square root of 18678378 is about 4321.8489098996. The cubic root of 18678378 is about 265.3259451969.

The spelling of 18678378 in words is "eighteen million, six hundred seventy-eight thousand, three hundred seventy-eight".