138655437 has 8 divisors (see below), whose sum is σ = 184941504. Its totient is φ = 92403168.

The previous prime is 138655427. The next prime is 138655453. The reversal of 138655437 is 734556831.

138655437 is digitally balanced in base 2, 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 not a de Polignac number, because 138655437 - 2⁴ = 138655421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138655427) 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, 3568 + ... + 17030.

It is an arithmetic number, because the mean of its divisors is an integer number (23117688).

Almost surely, 2^138655437 is an apocalyptic number.

It is an amenable number.

138655437 is a deficient number, since it is larger than the sum of its proper divisors (46286067).

138655437 is a wasteful number, since it uses less digits than its factorization.

138655437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16899.

The product of its digits is 302400, while the sum is 42.

The square root of 138655437 is about 11775.2043294373. The cubic root of 138655437 is about 517.5817658848.

The spelling of 138655437 in words is "one hundred thirty-eight million, six hundred fifty-five thousand, four hundred thirty-seven".