189764389 has 2 divisors, whose sum is σ = 189764390. Its totient is φ = 189764388.

The previous prime is 189764369. The next prime is 189764413. The reversal of 189764389 is 983467981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160149025 + 29615364 = 12655^2 + 5442^2 .

It is a cyclic number.

It is not a de Polignac number, because 189764389 - 2⁵ = 189764357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189764339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94882194 + 94882195.

It is an arithmetic number, because the mean of its divisors is an integer number (94882195).

Almost surely, 2^189764389 is an apocalyptic number.

It is an amenable number.

189764389 is a deficient number, since it is larger than the sum of its proper divisors (1).

189764389 is an equidigital number, since it uses as much as digits as its factorization.

189764389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 189764389 is about 13775.4995916664. The cubic root of 189764389 is about 574.6519774272.

The spelling of 189764389 in words is "one hundred eighty-nine million, seven hundred sixty-four thousand, three hundred eighty-nine".