138275278 has 8 divisors (see below), whose sum is σ = 208805400. Its totient is φ = 68673480.

The previous prime is 138275273. The next prime is 138275279. The reversal of 138275278 is 872572831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138275273) 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, 231708 + ... + 232303.

It is an arithmetic number, because the mean of its divisors is an integer number (26100675).

Almost surely, 2^138275278 is an apocalyptic number.

138275278 is a deficient number, since it is larger than the sum of its proper divisors (70530122).

138275278 is a wasteful number, since it uses less digits than its factorization.

138275278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464162.

The product of its digits is 188160, while the sum is 43.

The square root of 138275278 is about 11759.0508970750. The cubic root of 138275278 is about 517.1083057481.

The spelling of 138275278 in words is "one hundred thirty-eight million, two hundred seventy-five thousand, two hundred seventy-eight".