18898081 has 4 divisors (see below), whose sum is σ = 18918592. Its totient is φ = 18877572.

The previous prime is 18898079. The next prime is 18898091. The reversal of 18898081 is 18089881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18898081 - 2¹ = 18898079 is a prime.

It is a super-2 number, since 2×18898081² = 714274930965122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18898091) 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, 8805 + ... + 10738.

It is an arithmetic number, because the mean of its divisors is an integer number (4729648).

Almost surely, 2^18898081 is an apocalyptic number.

It is an amenable number.

18898081 is a deficient number, since it is larger than the sum of its proper divisors (20511).

18898081 is an equidigital number, since it uses as much as digits as its factorization.

18898081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20510.

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 18898081 is about 4347.1923122862. The cubic root of 18898081 is about 266.3621849384.

The spelling of 18898081 in words is "eighteen million, eight hundred ninety-eight thousand, eighty-one".