138215000 has 160 divisors (see below), whose sum is σ = 404870400. Its totient is φ = 42960000.

The previous prime is 138214991. The next prime is 138215023. The reversal of 138215000 is 512831.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 384821 + ... + 385179.

It is an arithmetic number, because the mean of its divisors is an integer number (2530440).

Almost surely, 2^138215000 is an apocalyptic number.

138215000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138215000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202435200).

138215000 is an abundant number, since it is smaller than the sum of its proper divisors (266655400).

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

138215000 is a wasteful number, since it uses less digits than its factorization.

138215000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 138215000 is about 11756.4875706990. The cubic root of 138215000 is about 517.0331542452.

Adding to 138215000 its reverse (512831), we get a palindrome (138727831).

The spelling of 138215000 in words is "one hundred thirty-eight million, two hundred fifteen thousand".