18771968 has 26 divisors (see below), whose sum is σ = 37547544. Its totient is φ = 9383936.

The previous prime is 18771967. The next prime is 18772001. The reversal of 18771968 is 86917781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18771967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805 + ... + 6387.

Almost surely, 2^18771968 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 18771968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18773772).

18771968 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18771968 is an frugal number, since it uses more digits than its factorization.

18771968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607 (or 4585 counting only the distinct ones).

The product of its digits is 169344, while the sum is 47.

The square root of 18771968 is about 4332.6629224993. The cubic root of 18771968 is about 265.7683550617.

The spelling of 18771968 in words is "eighteen million, seven hundred seventy-one thousand, nine hundred sixty-eight".