138666254 has 16 divisors (see below), whose sum is σ = 210567600. Its totient is φ = 68482560.

The previous prime is 138666221. The next prime is 138666257. The reversal of 138666254 is 452666831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138666257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56309 + ... + 58719.

It is an arithmetic number, because the mean of its divisors is an integer number (13160475).

Almost surely, 2^138666254 is an apocalyptic number.

138666254 is a deficient number, since it is larger than the sum of its proper divisors (71901346).

138666254 is a wasteful number, since it uses less digits than its factorization.

138666254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755.

The product of its digits is 207360, while the sum is 41.

The square root of 138666254 is about 11775.6636331037. The cubic root of 138666254 is about 517.5952249949.

The spelling of 138666254 in words is "one hundred thirty-eight million, six hundred sixty-six thousand, two hundred fifty-four".