1385785837 has 2 divisors, whose sum is σ = 1385785838. Its totient is φ = 1385785836.

The previous prime is 1385785831. The next prime is 1385785853. The reversal of 1385785837 is 7385875831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706974921 + 678810916 = 26589^2 + 26054^2 .

It is an emirp because it is prime and its reverse (7385875831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1385785837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385785831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692892918 + 692892919.

It is an arithmetic number, because the mean of its divisors is an integer number (692892919).

Almost surely, 2^1385785837 is an apocalyptic number.

It is an amenable number.

1385785837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385785837 is an equidigital number, since it uses as much as digits as its factorization.

1385785837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 55.

The square root of 1385785837 is about 37226.1445357963. The cubic root of 1385785837 is about 1114.8900498203.

The spelling of 1385785837 in words is "one billion, three hundred eighty-five million, seven hundred eighty-five thousand, eight hundred thirty-seven".