138668604 has 24 divisors (see below), whose sum is σ = 334718160. Its totient is φ = 44628864.

The previous prime is 138668603. The next prime is 138668623. The reversal of 138668604 is 406866831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138668603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198889 + ... + 199584.

It is an arithmetic number, because the mean of its divisors is an integer number (13946590).

Almost surely, 2^138668604 is an apocalyptic number.

It is an amenable number.

138668604 is an abundant number, since it is smaller than the sum of its proper divisors (196049556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138668604 is a wasteful number, since it uses less digits than its factorization.

138668604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398509 (or 398507 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 138668604 is about 11775.7634147430. The cubic root of 138668604 is about 517.5981489024.

The spelling of 138668604 in words is "one hundred thirty-eight million, six hundred sixty-eight thousand, six hundred four".