138664324 has 24 divisors (see below), whose sum is σ = 248595480. Its totient is φ = 67651584.

The previous prime is 138664289. The next prime is 138664327. The reversal of 138664324 is 423466831.

It can be written as a sum of positive squares in 4 ways, for example, as 54612100 + 84052224 = 7390^2 + 9168^2 .

It is not an unprimeable number, because it can be changed into a prime (138664327) 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 7 ways as a sum of consecutive naturals, for example, 39222 + ... + 42610.

It is an arithmetic number, because the mean of its divisors is an integer number (10358145).

Almost surely, 2^138664324 is an apocalyptic number.

It is an amenable number.

138664324 is a deficient number, since it is larger than the sum of its proper divisors (109931156).

138664324 is a wasteful number, since it uses less digits than its factorization.

138664324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639 (or 3637 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 138664324 is about 11775.5816841462. The cubic root of 138664324 is about 517.5928236334.

The spelling of 138664324 in words is "one hundred thirty-eight million, six hundred sixty-four thousand, three hundred twenty-four".