138326481 has 8 divisors (see below), whose sum is σ = 204928160. Its totient is φ = 92217636.

The previous prime is 138326477. The next prime is 138326533. The reversal of 138326481 is 184623831.

138326481 is a `hidden beast` number, since 1 + 3 + 8 + 3 + 2 + 648 + 1 = 666.

138326481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138326481 - 2² = 138326477 is a prime.

It is a super-2 number, since 2×138326481² = 38268430691686722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138326411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2561575 + ... + 2561628.

It is an arithmetic number, because the mean of its divisors is an integer number (25616020).

Almost surely, 2^138326481 is an apocalyptic number.

It is an amenable number.

138326481 is a deficient number, since it is larger than the sum of its proper divisors (66601679).

138326481 is an equidigital number, since it uses as much as digits as its factorization.

138326481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123212 (or 5123206 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 138326481 is about 11761.2278695721. The cubic root of 138326481 is about 517.1721258550.

The spelling of 138326481 in words is "one hundred thirty-eight million, three hundred twenty-six thousand, four hundred eighty-one".