18670889 has 2 divisors, whose sum is σ = 18670890. Its totient is φ = 18670888.

The previous prime is 18670859. The next prime is 18670907. The reversal of 18670889 is 98807681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 5040025 = 3692^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 18670889 - 2²⁰ = 17622313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18670849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335444 + 9335445.

It is an arithmetic number, because the mean of its divisors is an integer number (9335445).

Almost surely, 2^18670889 is an apocalyptic number.

It is an amenable number.

18670889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18670889 is an equidigital number, since it uses as much as digits as its factorization.

18670889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18670889 is about 4320.9824114430. The cubic root of 18670889 is about 265.2904800970.

The spelling of 18670889 in words is "eighteen million, six hundred seventy thousand, eight hundred eighty-nine".