138161000 has 64 divisors (see below), whose sum is σ = 337409280. Its totient is φ = 52852800.

The previous prime is 138160993. The next prime is 138161011. The reversal of 138161000 is 161831.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19997 + ... + 26003.

It is an arithmetic number, because the mean of its divisors is an integer number (5272020).

Almost surely, 2^138161000 is an apocalyptic number.

138161000 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 138161000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168704640).

138161000 is an abundant number, since it is smaller than the sum of its proper divisors (199248280).

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

138161000 is a wasteful number, since it uses less digits than its factorization.

138161000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051 (or 6037 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 138161000 is about 11754.1907420290. The cubic root of 138161000 is about 516.9658112718.

The spelling of 138161000 in words is "one hundred thirty-eight million, one hundred sixty-one thousand".