1385386281 has 8 divisors (see below), whose sum is σ = 2052424160. Its totient is φ = 923590836.

The previous prime is 1385386279. The next prime is 1385386291. The reversal of 1385386281 is 1826835831.

1385386281 is a `hidden beast` number, since 1 + 38 + 538 + 6 + 2 + 81 = 666.

It is not a de Polignac number, because 1385386281 - 2¹ = 1385386279 is a prime.

It is a super-2 number, since 2×1385386281² = 3838590295166021922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385386201) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 25655275 + ... + 25655328.

It is an arithmetic number, because the mean of its divisors is an integer number (256553020).

Almost surely, 2^1385386281 is an apocalyptic number.

It is an amenable number.

1385386281 is a deficient number, since it is larger than the sum of its proper divisors (667037879).

1385386281 is an equidigital number, since it uses as much as digits as its factorization.

1385386281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51310612 (or 51310606 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 1385386281 is about 37220.7775442695. Note that the first 3 decimals coincide. The cubic root of 1385386281 is about 1114.7828894842.

The spelling of 1385386281 in words is "one billion, three hundred eighty-five million, three hundred eighty-six thousand, two hundred eighty-one".