138561164 has 12 divisors (see below), whose sum is σ = 277122384. Its totient is φ = 59383344.

The previous prime is 138561161. The next prime is 138561187. The reversal of 138561164 is 461165831.

138561164 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (138561161) 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, 2474279 + ... + 2474334.

It is an arithmetic number, because the mean of its divisors is an integer number (23093532).

Almost surely, 2^138561164 is an apocalyptic number.

138561164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138561164 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138561164 is a wasteful number, since it uses less digits than its factorization.

138561164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948624 (or 4948622 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 138561164 is about 11771.2006184586. The cubic root of 138561164 is about 517.4644365550.

The spelling of 138561164 in words is "one hundred thirty-eight million, five hundred sixty-one thousand, one hundred sixty-four".