18891168 has 48 divisors (see below), whose sum is σ = 52204320. Its totient is φ = 5965056.

The previous prime is 18891143. The next prime is 18891193. The reversal of 18891168 is 86119881.

It is an interprime number because it is at equal distance from previous prime (18891143) and next prime (18891193).

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3355 + ... + 7002.

It is an arithmetic number, because the mean of its divisors is an integer number (1087590).

Almost surely, 2^18891168 is an apocalyptic number.

It is an amenable number.

18891168 is an abundant number, since it is smaller than the sum of its proper divisors (33313152).

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

18891168 is a wasteful number, since it uses less digits than its factorization.

18891168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389 (or 10381 counting only the distinct ones).

The product of its digits is 27648, while the sum is 42.

The square root of 18891168 is about 4346.3971286573. The cubic root of 18891168 is about 266.3297021631.

The spelling of 18891168 in words is "eighteen million, eight hundred ninety-one thousand, one hundred sixty-eight".