138161816 has 16 divisors (see below), whose sum is σ = 278980800. Its totient is φ = 63766944.

The previous prime is 138161801. The next prime is 138161819. The reversal of 138161816 is 618161831.

138161816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138161819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664136 + ... + 664343.

It is an arithmetic number, because the mean of its divisors is an integer number (17436300).

Almost surely, 2^138161816 is an apocalyptic number.

It is an amenable number.

138161816 is an abundant number, since it is smaller than the sum of its proper divisors (140818984).

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

138161816 is a wasteful number, since it uses less digits than its factorization.

138161816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328498 (or 1328494 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 138161816 is about 11754.2254530020. The cubic root of 138161816 is about 516.9668290296.

The spelling of 138161816 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, eight hundred sixteen".