18785240 has 16 divisors (see below), whose sum is σ = 42266880. Its totient is φ = 7514080.

The previous prime is 18785237. The next prime is 18785317. The reversal of 18785240 is 4258781.

It is a self number, because there is not a number n which added to its sum of digits gives 18785240.

It is a congruent number.

It is an unprimeable number.

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, 234776 + ... + 234855.

It is an arithmetic number, because the mean of its divisors is an integer number (2641680).

Almost surely, 2^18785240 is an apocalyptic number.

18785240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18785240 is an abundant number, since it is smaller than the sum of its proper divisors (23481640).

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

18785240 is a wasteful number, since it uses less digits than its factorization.

18785240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469642 (or 469638 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 18785240 is about 4334.1942734492. The cubic root of 18785240 is about 265.8309740807.

The spelling of 18785240 in words is "eighteen million, seven hundred eighty-five thousand, two hundred forty".