138818254 has 4 divisors (see below), whose sum is σ = 208227384. Its totient is φ = 69409126.

The previous prime is 138818219. The next prime is 138818261. The reversal of 138818254 is 452818831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 452818831 = 13121 ⋅34511.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34704562 + ... + 34704565.

It is an arithmetic number, because the mean of its divisors is an integer number (52056846).

Almost surely, 2^138818254 is an apocalyptic number.

138818254 is a deficient number, since it is larger than the sum of its proper divisors (69409130).

138818254 is an equidigital number, since it uses as much as digits as its factorization.

138818254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69409129.

The product of its digits is 61440, while the sum is 40.

The square root of 138818254 is about 11782.1158541240. The cubic root of 138818254 is about 517.7842778296.

The spelling of 138818254 in words is "one hundred thirty-eight million, eight hundred eighteen thousand, two hundred fifty-four".