18698089 has 2 divisors, whose sum is σ = 18698090. Its totient is φ = 18698088.

The previous prime is 18698087. The next prime is 18698107. The reversal of 18698089 is 98089681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 1016064 = 4205^2 + 1008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18698089 - 2¹ = 18698087 is a prime.

Together with 18698087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18698087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9349044 + 9349045.

It is an arithmetic number, because the mean of its divisors is an integer number (9349045).

Almost surely, 2^18698089 is an apocalyptic number.

It is an amenable number.

18698089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18698089 is an equidigital number, since it uses as much as digits as its factorization.

18698089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 18698089 is about 4324.1286983622. The cubic root of 18698089 is about 265.4192438250.

The spelling of 18698089 in words is "eighteen million, six hundred ninety-eight thousand, eighty-nine".