18718425 has 48 divisors (see below), whose sum is σ = 37527360. Its totient is φ = 9072000.

The previous prime is 18718417. The next prime is 18718433. The reversal of 18718425 is 52481781.

It is an interprime number because it is at equal distance from previous prime (18718417) and next prime (18718433).

It is not a de Polignac number, because 18718425 - 2³ = 18718417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18718425.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6165 + ... + 8685.

It is an arithmetic number, because the mean of its divisors is an integer number (781820).

Almost surely, 2^18718425 is an apocalyptic number.

18718425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18718425 is an abundant number, since it is smaller than the sum of its proper divisors (18808935).

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

18718425 is a wasteful number, since it uses less digits than its factorization.

18718425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2540 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 18718425 is about 4326.4795157264. The cubic root of 18718425 is about 265.5154320884.

It can be divided in two parts, 1871 and 8425, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 18718425 in words is "eighteen million, seven hundred eighteen thousand, four hundred twenty-five".