138634590 has 16 divisors (see below), whose sum is σ = 332723088. Its totient is φ = 36969216.

The previous prime is 138634589. The next prime is 138634603. The reversal of 138634590 is 95436831.

138634590 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 2310547 + ... + 2310606.

It is an arithmetic number, because the mean of its divisors is an integer number (20795193).

Almost surely, 2^138634590 is an apocalyptic number.

138634590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138634590 is an abundant number, since it is smaller than the sum of its proper divisors (194088498).

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

138634590 is a wasteful number, since it uses less digits than its factorization.

138634590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4621163.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 138634590 is about 11774.3190885928. The cubic root of 138634590 is about 517.5558249189. Note that the first 3 decimals are identical.

The spelling of 138634590 in words is "one hundred thirty-eight million, six hundred thirty-four thousand, five hundred ninety".