1385738566 has 4 divisors (see below), whose sum is σ = 2078607852. Its totient is φ = 692869282.

The previous prime is 1385738551. The next prime is 1385738579. The reversal of 1385738566 is 6658375831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6658375831 = 1973 ⋅3374747.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346434640 + ... + 346434643.

It is an arithmetic number, because the mean of its divisors is an integer number (519651963).

Almost surely, 2^1385738566 is an apocalyptic number.

1385738566 is a deficient number, since it is larger than the sum of its proper divisors (692869286).

1385738566 is an equidigital number, since it uses as much as digits as its factorization.

1385738566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692869285.

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

The square root of 1385738566 is about 37225.5096137044. The cubic root of 1385738566 is about 1114.8773728815.

The spelling of 1385738566 in words is "one billion, three hundred eighty-five million, seven hundred thirty-eight thousand, five hundred sixty-six".