138027321 has 10 divisors (see below), whose sum is σ = 206189082. Its totient is φ = 92018160.

The previous prime is 138027293. The next prime is 138027359. The reversal of 138027321 is 123720831.

It can be written as a sum of positive squares in only one way, i.e., 122345721 + 15681600 = 11061^2 + 3960^2 .

It is not a de Polignac number, because 138027321 - 2⁵ = 138027289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138027121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 851940 + ... + 852101.

Almost surely, 2^138027321 is an apocalyptic number.

It is an amenable number.

138027321 is a deficient number, since it is larger than the sum of its proper divisors (68161761).

138027321 is an equidigital number, since it uses as much as digits as its factorization.

138027321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704053 (or 1704044 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 138027321 is about 11748.5029259051. The cubic root of 138027321 is about 516.7990257265.

The spelling of 138027321 in words is "one hundred thirty-eight million, twenty-seven thousand, three hundred twenty-one".