389231729 has 2 divisors, whose sum is σ = 389231730. Its totient is φ = 389231728.

The previous prime is 389231683. The next prime is 389231771. The reversal of 389231729 is 927132983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264127504 + 125104225 = 16252^2 + 11185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389231729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389231729.

It is not a weakly prime, because it can be changed into another prime (389231429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194615864 + 194615865.

It is an arithmetic number, because the mean of its divisors is an integer number (194615865).

Almost surely, 2^389231729 is an apocalyptic number.

It is an amenable number.

389231729 is a deficient number, since it is larger than the sum of its proper divisors (1).

389231729 is an equidigital number, since it uses as much as digits as its factorization.

389231729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 389231729 is about 19728.9566120462. The cubic root of 389231729 is about 730.1342900504.

The spelling of 389231729 in words is "three hundred eighty-nine million, two hundred thirty-one thousand, seven hundred twenty-nine".