138168404 has 24 divisors (see below), whose sum is σ = 266396256. Its totient is φ = 62180000.

The previous prime is 138168389. The next prime is 138168409. The reversal of 138168404 is 404861831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138168409) 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, 11102 + ... + 19989.

It is an arithmetic number, because the mean of its divisors is an integer number (11099844).

Almost surely, 2^138168404 is an apocalyptic number.

It is an amenable number.

138168404 is a deficient number, since it is larger than the sum of its proper divisors (128227852).

138168404 is a wasteful number, since it uses less digits than its factorization.

138168404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31207 (or 31205 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 138168404 is about 11754.5056893091. The cubic root of 138168404 is about 516.9750457796.

The spelling of 138168404 in words is "one hundred thirty-eight million, one hundred sixty-eight thousand, four hundred four".