138936023 has 4 divisors (see below), whose sum is σ = 139641480. Its totient is φ = 138230568.

The previous prime is 138936011. The next prime is 138936043. The reversal of 138936023 is 320639831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320639831 = 2153 ⋅148927.

It is a cyclic number.

It is not a de Polignac number, because 138936023 - 2⁸ = 138935767 is a prime.

It is a super-3 number, since 3×138936023³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138936043) 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, 352433 + ... + 352826.

It is an arithmetic number, because the mean of its divisors is an integer number (34910370).

Almost surely, 2^138936023 is an apocalyptic number.

138936023 is a deficient number, since it is larger than the sum of its proper divisors (705457).

138936023 is an equidigital number, since it uses as much as digits as its factorization.

138936023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705456.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 138936023 is about 11787.1125811201. The cubic root of 138936023 is about 517.9306603568.

The spelling of 138936023 in words is "one hundred thirty-eight million, nine hundred thirty-six thousand, twenty-three".