138000861 has 16 divisors (see below), whose sum is σ = 209972800. Its totient is φ = 89513424.

The previous prime is 138000847. The next prime is 138000887. The reversal of 138000861 is 168000831.

It is not a de Polignac number, because 138000861 - 2⁵ = 138000829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138000061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68071 + ... + 70068.

It is an arithmetic number, because the mean of its divisors is an integer number (13123300).

Almost surely, 2^138000861 is an apocalyptic number.

It is an amenable number.

138000861 is a deficient number, since it is larger than the sum of its proper divisors (71971939).

138000861 is a wasteful number, since it uses less digits than its factorization.

138000861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138185 (or 138179 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 138000861 is about 11747.3767710072. The cubic root of 138000861 is about 516.7659999554.

The spelling of 138000861 in words is "one hundred thirty-eight million, eight hundred sixty-one", and thus it is an aban number.