138266278 has 8 divisors (see below), whose sum is σ = 207504000. Its totient is φ = 69098280.

The previous prime is 138266267. The next prime is 138266327. The reversal of 138266278 is 872662831.

138266278 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12153 + ... + 20596.

It is an arithmetic number, because the mean of its divisors is an integer number (25938000).

Almost surely, 2^138266278 is an apocalyptic number.

138266278 is a deficient number, since it is larger than the sum of its proper divisors (69237722).

138266278 is a wasteful number, since it uses less digits than its factorization.

138266278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34862.

The product of its digits is 193536, while the sum is 43.

The square root of 138266278 is about 11758.6682069017. The cubic root of 138266278 is about 517.0970863993.

The spelling of 138266278 in words is "one hundred thirty-eight million, two hundred sixty-six thousand, two hundred seventy-eight".