138900000 has 144 divisors (see below), whose sum is σ = 456720768. Its totient is φ = 36960000.

The previous prime is 138899963. The next prime is 138900007. The reversal of 138900000 is 9831.

It is a self number, because there is not a number n which added to its sum of digits gives 138900000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138900007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299769 + ... + 300231.

It is an arithmetic number, because the mean of its divisors is an integer number (3171672).

Almost surely, 2^138900000 is an apocalyptic number.

138900000 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 138900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228360384).

138900000 is an abundant number, since it is smaller than the sum of its proper divisors (317820768).

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

138900000 is an frugal number, since it uses more digits than its factorization.

138900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 138900000 is about 11785.5844148689. The cubic root of 138900000 is about 517.8858938796.

Adding to 138900000 its reverse (9831), we get a palindrome (138909831).

The spelling of 138900000 in words is "one hundred thirty-eight million, nine hundred thousand".