18942089 has 2 divisors, whose sum is σ = 18942090. Its totient is φ = 18942088.

The previous prime is 18942083. The next prime is 18942101. The reversal of 18942089 is 98024981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 7382089 = 3400^2 + 2717^2 .

It is a cyclic number.

It is not a de Polignac number, because 18942089 - 2⁴ = 18942073 is a prime.

It is not a weakly prime, because it can be changed into another prime (18942083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471044 + 9471045.

It is an arithmetic number, because the mean of its divisors is an integer number (9471045).

Almost surely, 2^18942089 is an apocalyptic number.

It is an amenable number.

18942089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942089 is an equidigital number, since it uses as much as digits as its factorization.

18942089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18942089 is about 4352.2510267676. The cubic root of 18942089 is about 266.5687840409.

The spelling of 18942089 in words is "eighteen million, nine hundred forty-two thousand, eighty-nine".