18851968 has 32 divisors (see below), whose sum is σ = 38776320. Its totient is φ = 9120000.

The previous prime is 18851957. The next prime is 18851969. The reversal of 18851968 is 86915881.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18851969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1593 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (1211760).

Almost surely, 2^18851968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18851968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19388160).

18851968 is an abundant number, since it is smaller than the sum of its proper divisors (19924352).

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

18851968 is an equidigital number, since it uses as much as digits as its factorization.

18851968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796 (or 4784 counting only the distinct ones).

The product of its digits is 138240, while the sum is 46.

The square root of 18851968 is about 4341.8853047956. The cubic root of 18851968 is about 266.1453593369.

The spelling of 18851968 in words is "eighteen million, eight hundred fifty-one thousand, nine hundred sixty-eight".