138123117 has 16 divisors (see below), whose sum is σ = 223229760. Its totient is φ = 83710800.

The previous prime is 138123101. The next prime is 138123127. The reversal of 138123117 is 711321831.

It is a happy number.

It is not a de Polignac number, because 138123117 - 2⁴ = 138123101 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138123127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232234 + ... + 232827.

It is an arithmetic number, because the mean of its divisors is an integer number (13951860).

Almost surely, 2^138123117 is an apocalyptic number.

It is an amenable number.

138123117 is a deficient number, since it is larger than the sum of its proper divisors (85106643).

138123117 is a wasteful number, since it uses less digits than its factorization.

138123117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465081 (or 465075 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 138123117 is about 11752.5791637410. The cubic root of 138123117 is about 516.9185572082.

Adding to 138123117 its reverse (711321831), we get a palindrome (849444948).

The spelling of 138123117 in words is "one hundred thirty-eight million, one hundred twenty-three thousand, one hundred seventeen".