385943813 has 2 divisors, whose sum is σ = 385943814. Its totient is φ = 385943812.

The previous prime is 385943807. The next prime is 385943863. The reversal of 385943813 is 318349583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241895809 + 144048004 = 15553^2 + 12002^2 .

It is a cyclic number.

It is not a de Polignac number, because 385943813 - 2¹² = 385939717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385943863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192971906 + 192971907.

It is an arithmetic number, because the mean of its divisors is an integer number (192971907).

Almost surely, 2^385943813 is an apocalyptic number.

It is an amenable number.

385943813 is a deficient number, since it is larger than the sum of its proper divisors (1).

385943813 is an equidigital number, since it uses as much as digits as its factorization.

385943813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 385943813 is about 19645.4527308484. The cubic root of 385943813 is about 728.0726119307.

The spelling of 385943813 in words is "three hundred eighty-five million, nine hundred forty-three thousand, eight hundred thirteen".