1538133785 has 8 divisors (see below), whose sum is σ = 1845996360. Its totient is φ = 1230349824.

The previous prime is 1538133767. The next prime is 1538133787. The reversal of 1538133785 is 5873318351.

It can be written as a sum of positive squares in 4 ways, for example, as 476156041 + 1061977744 = 21821^2 + 32588^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1538133785 - 2⁶ = 1538133721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1538133787) 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 in 7 ways as a sum of consecutive naturals, for example, 39689 + ... + 68201.

It is an arithmetic number, because the mean of its divisors is an integer number (230749545).

Almost surely, 2^1538133785 is an apocalyptic number.

It is an amenable number.

1538133785 is a deficient number, since it is larger than the sum of its proper divisors (307862575).

1538133785 is a wasteful number, since it uses less digits than its factorization.

1538133785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39307.

The product of its digits is 302400, while the sum is 44.

The square root of 1538133785 is about 39219.0487518502. The cubic root of 1538133785 is about 1154.3336886332. Note that the first 3 decimals are identical.

The spelling of 1538133785 in words is "one billion, five hundred thirty-eight million, one hundred thirty-three thousand, seven hundred eighty-five".