389733661 has 2 divisors, whose sum is σ = 389733662. Its totient is φ = 389733660.

The previous prime is 389733637. The next prime is 389733667. The reversal of 389733661 is 166337983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378302500 + 11431161 = 19450^2 + 3381^2 .

It is a cyclic number.

It is not a de Polignac number, because 389733661 - 2⁵ = 389733629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389733667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194866830 + 194866831.

It is an arithmetic number, because the mean of its divisors is an integer number (194866831).

Almost surely, 2^389733661 is an apocalyptic number.

It is an amenable number.

389733661 is a deficient number, since it is larger than the sum of its proper divisors (1).

389733661 is an equidigital number, since it uses as much as digits as its factorization.

389733661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 46.

The square root of 389733661 is about 19741.6732066965. The cubic root of 389733661 is about 730.4480023542.

The spelling of 389733661 in words is "three hundred eighty-nine million, seven hundred thirty-three thousand, six hundred sixty-one".