18851856 has 60 divisors (see below), whose sum is σ = 50545872. Its totient is φ = 6054272.

The previous prime is 18851851. The next prime is 18851863. The reversal of 18851856 is 65815881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18851851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40135 + ... + 40601.

Almost surely, 2^18851856 is an apocalyptic number.

18851856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18851856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25272936).

18851856 is an abundant number, since it is smaller than the sum of its proper divisors (31694016).

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

18851856 is a wasteful number, since it uses less digits than its factorization.

18851856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 501 counting only the distinct ones).

The product of its digits is 76800, while the sum is 42.

The square root of 18851856 is about 4341.8724071534. The cubic root of 18851856 is about 266.1448322771.

It can be divided in two parts, 1885 and 1856, that added together give a triangular number (3741 = T₈₆).

The spelling of 18851856 in words is "eighteen million, eight hundred fifty-one thousand, eight hundred fifty-six".