138663884 has 6 divisors (see below), whose sum is σ = 242661804. Its totient is φ = 69331940.

The previous prime is 138663871. The next prime is 138663887. The reversal of 138663884 is 488366831.

138663884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×138663884³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138663887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17332982 + ... + 17332989.

It is an arithmetic number, because the mean of its divisors is an integer number (40443634).

Almost surely, 2^138663884 is an apocalyptic number.

It is an amenable number.

138663884 is a deficient number, since it is larger than the sum of its proper divisors (103997920).

138663884 is a wasteful number, since it uses less digits than its factorization.

138663884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34665975 (or 34665973 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 138663884 is about 11775.5630014025. The cubic root of 138663884 is about 517.5922761696.

The spelling of 138663884 in words is "one hundred thirty-eight million, six hundred sixty-three thousand, eight hundred eighty-four".