138866896 has 40 divisors (see below), whose sum is σ = 323679680. Its totient is φ = 56381184.

The previous prime is 138866891. The next prime is 138866929. The reversal of 138866896 is 698668831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138866891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30501 + ... + 34756.

It is an arithmetic number, because the mean of its divisors is an integer number (8091992).

Almost surely, 2^138866896 is an apocalyptic number.

138866896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138866896 is an abundant number, since it is smaller than the sum of its proper divisors (184812784).

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

138866896 is a wasteful number, since it uses less digits than its factorization.

138866896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65291 (or 65285 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 55.

The square root of 138866896 is about 11784.1799035826. The cubic root of 138866896 is about 517.8447480750.

The spelling of 138866896 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, eight hundred ninety-six".