138780268 has 12 divisors (see below), whose sum is σ = 264944232. Its totient is φ = 63081920.

The previous prime is 138780263. The next prime is 138780277. The reversal of 138780268 is 862087831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138780263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1577005 + ... + 1577092.

It is an arithmetic number, because the mean of its divisors is an integer number (22078686).

Almost surely, 2^138780268 is an apocalyptic number.

It is an amenable number.

138780268 is a deficient number, since it is larger than the sum of its proper divisors (126163964).

138780268 is a wasteful number, since it uses less digits than its factorization.

138780268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154112 (or 3154110 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 138780268 is about 11780.5037243744. The cubic root of 138780268 is about 517.7370449734.

The spelling of 138780268 in words is "one hundred thirty-eight million, seven hundred eighty thousand, two hundred sixty-eight".