138744277 has 16 divisors (see below), whose sum is σ = 160348032. Its totient is φ = 117596160.

The previous prime is 138744269. The next prime is 138744343. The reversal of 138744277 is 772447831.

It is a cyclic number.

It is not a de Polignac number, because 138744277 - 2³ = 138744269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138744217) 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 15 ways as a sum of consecutive naturals, for example, 419002 + ... + 419332.

It is an arithmetic number, because the mean of its divisors is an integer number (10021752).

Almost surely, 2^138744277 is an apocalyptic number.

It is an amenable number.

138744277 is a deficient number, since it is larger than the sum of its proper divisors (21603755).

138744277 is a wasteful number, since it uses less digits than its factorization.

138744277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its digits is 263424, while the sum is 43.

The square root of 138744277 is about 11778.9760590639. The cubic root of 138744277 is about 517.6922848037.

The spelling of 138744277 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, two hundred seventy-seven".