18950389 has 2 divisors, whose sum is σ = 18950390. Its totient is φ = 18950388.

The previous prime is 18950381. The next prime is 18950431. The reversal of 18950389 is 98305981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 27889 = 4350^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 18950389 - 2³ = 18950381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18950381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9475194 + 9475195.

It is an arithmetic number, because the mean of its divisors is an integer number (9475195).

Almost surely, 2^18950389 is an apocalyptic number.

It is an amenable number.

18950389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18950389 is an equidigital number, since it uses as much as digits as its factorization.

18950389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18950389 is about 4353.2044518952. The cubic root of 18950389 is about 266.6077131831.

The spelling of 18950389 in words is "eighteen million, nine hundred fifty thousand, three hundred eighty-nine".