18745840 has 20 divisors (see below), whose sum is σ = 43584264. Its totient is φ = 7498304.

The previous prime is 18745829. The next prime is 18745841. The reversal of 18745840 is 4854781.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 18745840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18745841) 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 3 ways as a sum of consecutive naturals, for example, 117082 + ... + 117241.

Almost surely, 2^18745840 is an apocalyptic number.

18745840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18745840 is an abundant number, since it is smaller than the sum of its proper divisors (24838424).

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

18745840 is a wasteful number, since it uses less digits than its factorization.

18745840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234336 (or 234330 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 18745840 is about 4329.6466368516. The cubic root of 18745840 is about 265.6449934662.

The spelling of 18745840 in words is "eighteen million, seven hundred forty-five thousand, eight hundred forty".