1385402066 has 4 divisors (see below), whose sum is σ = 2078103102. Its totient is φ = 692701032.

The previous prime is 1385402023. The next prime is 1385402071. The reversal of 1385402066 is 6602045831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1293912841 + 91489225 = 35971^2 + 9565^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346350515 + ... + 346350518.

Almost surely, 2^1385402066 is an apocalyptic number.

1385402066 is a deficient number, since it is larger than the sum of its proper divisors (692701036).

1385402066 is an equidigital number, since it uses as much as digits as its factorization.

1385402066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692701035.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1385402066 is about 37220.9895892089. The cubic root of 1385402066 is about 1114.7871233891.

Adding to 1385402066 its reverse (6602045831), we get a palindrome (7987447897).

The spelling of 1385402066 in words is "one billion, three hundred eighty-five million, four hundred two thousand, sixty-six".