138107623 has 4 divisors (see below), whose sum is σ = 138278728. Its totient is φ = 137936520.

The previous prime is 138107621. The next prime is 138107647. The reversal of 138107623 is 326701831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326701831 = 43 ⋅7597717.

It is a cyclic number.

It is not a de Polignac number, because 138107623 - 2¹ = 138107621 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 (138107621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84336 + ... + 85957.

It is an arithmetic number, because the mean of its divisors is an integer number (34569682).

Almost surely, 2^138107623 is an apocalyptic number.

138107623 is a deficient number, since it is larger than the sum of its proper divisors (171105).

138107623 is an equidigital number, since it uses as much as digits as its factorization.

138107623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171104.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 138107623 is about 11751.9199707963. The cubic root of 138107623 is about 516.8992279900.

The spelling of 138107623 in words is "one hundred thirty-eight million, one hundred seven thousand, six hundred twenty-three".