1620327389 has 2 divisors, whose sum is σ = 1620327390. Its totient is φ = 1620327388.

The previous prime is 1620327377. The next prime is 1620327413. The reversal of 1620327389 is 9837230261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191423289 + 428904100 = 34517^2 + 20710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620327389 - 2²⁴ = 1603550173 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 (1620327349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810163694 + 810163695.

It is an arithmetic number, because the mean of its divisors is an integer number (810163695).

Almost surely, 2^1620327389 is an apocalyptic number.

It is an amenable number.

1620327389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620327389 is an equidigital number, since it uses as much as digits as its factorization.

1620327389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1620327389 is about 40253.2904120893. The cubic root of 1620327389 is about 1174.5394033551.

The spelling of 1620327389 in words is "one billion, six hundred twenty million, three hundred twenty-seven thousand, three hundred eighty-nine".