138133385 has 16 divisors (see below), whose sum is σ = 179144784. Its totient is φ = 101644032.

The previous prime is 138133367. The next prime is 138133393. The reversal of 138133385 is 583331831.

It can be written as a sum of positive squares in 8 ways, for example, as 2271049 + 135862336 = 1507^2 + 11656^2 .

It is a cyclic number.

It is not a de Polignac number, because 138133385 - 2⁸ = 138133129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15419 + ... + 22671.

It is an arithmetic number, because the mean of its divisors is an integer number (11196549).

Almost surely, 2^138133385 is an apocalyptic number.

It is an amenable number.

138133385 is a deficient number, since it is larger than the sum of its proper divisors (41011399).

138133385 is a wasteful number, since it uses less digits than its factorization.

138133385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7564.

The product of its digits is 25920, while the sum is 35.

The square root of 138133385 is about 11753.0159959051. The cubic root of 138133385 is about 516.9313660422.

The spelling of 138133385 in words is "one hundred thirty-eight million, one hundred thirty-three thousand, three hundred eighty-five".