138155398 has 8 divisors (see below), whose sum is σ = 207433800. Its totient is φ = 69010800.

The previous prime is 138155393. The next prime is 138155401. The reversal of 138155398 is 893551831.

138155398 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138155393) 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 3 ways as a sum of consecutive naturals, for example, 30828 + ... + 35023.

It is an arithmetic number, because the mean of its divisors is an integer number (25929225).

Almost surely, 2^138155398 is an apocalyptic number.

138155398 is a deficient number, since it is larger than the sum of its proper divisors (69278402).

138155398 is a wasteful number, since it uses less digits than its factorization.

138155398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66902.

The product of its digits is 129600, while the sum is 43.

The square root of 138155398 is about 11753.9524416258. The cubic root of 138155398 is about 516.9588240574.

The spelling of 138155398 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, three hundred ninety-eight".