138687468 has 12 divisors (see below), whose sum is σ = 323604120. Its totient is φ = 46229152.

The previous prime is 138687467. The next prime is 138687469. The reversal of 138687468 is 864786831.

It is an interprime number because it is at equal distance from previous prime (138687467) and next prime (138687469).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 138687468.

It is not an unprimeable number, because it can be changed into a prime (138687463) 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, 5778633 + ... + 5778656.

It is an arithmetic number, because the mean of its divisors is an integer number (26967010).

Almost surely, 2^138687468 is an apocalyptic number.

It is an amenable number.

138687468 is an abundant number, since it is smaller than the sum of its proper divisors (184916652).

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

138687468 is a wasteful number, since it uses less digits than its factorization.

138687468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11557296 (or 11557294 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The square root of 138687468 is about 11776.5643546834. The cubic root of 138687468 is about 517.6216185956.

The spelling of 138687468 in words is "one hundred thirty-eight million, six hundred eighty-seven thousand, four hundred sixty-eight".