18857940 has 24 divisors (see below), whose sum is σ = 52802400. Its totient is φ = 5028768.

The previous prime is 18857939. The next prime is 18857963. The reversal of 18857940 is 4975881.

It is a junction number, because it is equal to n+sod(n) for n = 18857892 and 18857901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157090 + ... + 157209.

It is an arithmetic number, because the mean of its divisors is an integer number (2200100).

Almost surely, 2^18857940 is an apocalyptic number.

18857940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18857940 is an abundant number, since it is smaller than the sum of its proper divisors (33944460).

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

18857940 is a wasteful number, since it uses less digits than its factorization.

18857940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314311 (or 314309 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18857940 is about 4342.5729700259. The cubic root of 18857940 is about 266.1734598917.

The spelling of 18857940 in words is "eighteen million, eight hundred fifty-seven thousand, nine hundred forty".