138066454 has 4 divisors (see below), whose sum is σ = 207099684. Its totient is φ = 69033226.

The previous prime is 138066443. The next prime is 138066457. The reversal of 138066454 is 454660831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 454660831 = 197 ⋅2307923.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138066457) 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 as a sum of consecutive naturals, namely, 34516612 + ... + 34516615.

It is an arithmetic number, because the mean of its divisors is an integer number (51774921).

Almost surely, 2^138066454 is an apocalyptic number.

138066454 is a deficient number, since it is larger than the sum of its proper divisors (69033230).

138066454 is an equidigital number, since it uses as much as digits as its factorization.

138066454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69033229.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 138066454 is about 11750.1682541145. The cubic root of 138066454 is about 516.8478614332.

The spelling of 138066454 in words is "one hundred thirty-eight million, sixty-six thousand, four hundred fifty-four".