138909600 has 288 divisors, whose sum is σ = 515592000. Its totient is φ = 36080640.

The previous prime is 138909593. The next prime is 138909613. The reversal of 138909600 is 6909831.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1274346 + ... + 1274454.

It is an arithmetic number, because the mean of its divisors is an integer number (1790250).

Almost surely, 2^138909600 is an apocalyptic number.

138909600 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 138909600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257796000).

138909600 is an abundant number, since it is smaller than the sum of its proper divisors (376682400).

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

138909600 is a wasteful number, since it uses less digits than its factorization.

138909600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 138909600 is about 11785.9916850471. The cubic root of 138909600 is about 517.8978247413.

The spelling of 138909600 in words is "one hundred thirty-eight million, nine hundred nine thousand, six hundred".