389504813 has 2 divisors, whose sum is σ = 389504814. Its totient is φ = 389504812.

The previous prime is 389504803. The next prime is 389504861. The reversal of 389504813 is 318405983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377408329 + 12096484 = 19427^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 389504813 - 2⁶ = 389504749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389504803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194752406 + 194752407.

It is an arithmetic number, because the mean of its divisors is an integer number (194752407).

Almost surely, 2^389504813 is an apocalyptic number.

It is an amenable number.

389504813 is a deficient number, since it is larger than the sum of its proper divisors (1).

389504813 is an equidigital number, since it uses as much as digits as its factorization.

389504813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 389504813 is about 19735.8762916674. The cubic root of 389504813 is about 730.3050035917.

The spelling of 389504813 in words is "three hundred eighty-nine million, five hundred four thousand, eight hundred thirteen".