1385665837 has 2 divisors, whose sum is σ = 1385665838. Its totient is φ = 1385665836.

The previous prime is 1385665783. The next prime is 1385665861. The reversal of 1385665837 is 7385665831.

Together with previous prime (1385665783) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698492041 + 687173796 = 26429^2 + 26214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385665837 - 2⁷ = 1385665709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385663837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692832918 + 692832919.

It is an arithmetic number, because the mean of its divisors is an integer number (692832919).

Almost surely, 2^1385665837 is an apocalyptic number.

It is an amenable number.

1385665837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385665837 is an equidigital number, since it uses as much as digits as its factorization.

1385665837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 52.

The square root of 1385665837 is about 37224.5327304454. The cubic root of 1385665837 is about 1114.8578681598.

The spelling of 1385665837 in words is "one billion, three hundred eighty-five million, six hundred sixty-five thousand, eight hundred thirty-seven".