18670789 has 2 divisors, whose sum is σ = 18670790. Its totient is φ = 18670788.

The previous prime is 18670753. The next prime is 18670801. The reversal of 18670789 is 98707681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 540225 = 4258^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 18670789 - 2⁷ = 18670661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18670889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335394 + 9335395.

It is an arithmetic number, because the mean of its divisors is an integer number (9335395).

Almost surely, 2^18670789 is an apocalyptic number.

It is an amenable number.

18670789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18670789 is an equidigital number, since it uses as much as digits as its factorization.

18670789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 18670789 is about 4320.9708399849. The cubic root of 18670789 is about 265.2900064703.

The spelling of 18670789 in words is "eighteen million, six hundred seventy thousand, seven hundred eighty-nine".