185340989 has 2 divisors, whose sum is σ = 185340990. Its totient is φ = 185340988.

The previous prime is 185340983. The next prime is 185341003. The reversal of 185340989 is 989043581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93276964 + 92064025 = 9658^2 + 9595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185340989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185340983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92670494 + 92670495.

It is an arithmetic number, because the mean of its divisors is an integer number (92670495).

Almost surely, 2^185340989 is an apocalyptic number.

It is an amenable number.

185340989 is a deficient number, since it is larger than the sum of its proper divisors (1).

185340989 is an equidigital number, since it uses as much as digits as its factorization.

185340989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 185340989 is about 13613.9997429117. Note that the first 3 decimals coincide. The cubic root of 185340989 is about 570.1517898818.

The spelling of 185340989 in words is "one hundred eighty-five million, three hundred forty thousand, nine hundred eighty-nine".