138121377 has 8 divisors (see below), whose sum is σ = 184227264. Its totient is φ = 92048208.

The previous prime is 138121367. The next prime is 138121411. The reversal of 138121377 is 773121831.

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

It is not a de Polignac number, because 138121377 - 2¹¹ = 138119329 is a prime.

It is a super-2 number, since 2×138121377² = 38155029568752258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (138121327) 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, 4468 + ... + 17210.

It is an arithmetic number, because the mean of its divisors is an integer number (23028408).

Almost surely, 2^138121377 is an apocalyptic number.

It is an amenable number.

138121377 is a deficient number, since it is larger than the sum of its proper divisors (46105887).

138121377 is a wasteful number, since it uses less digits than its factorization.

138121377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16359.

The product of its digits is 7056, while the sum is 33.

The square root of 138121377 is about 11752.5051372037. The cubic root of 138121377 is about 516.9163865794.

The spelling of 138121377 in words is "one hundred thirty-eight million, one hundred twenty-one thousand, three hundred seventy-seven".