138621023 has 8 divisors (see below), whose sum is σ = 147378528. Its totient is φ = 130091104.

The previous prime is 138621019. The next prime is 138621047. The reversal of 138621023 is 320126831.

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

It is a cyclic number.

It is not a de Polignac number, because 138621023 - 2² = 138621019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138620983 and 138621001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138621013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55640 + ... + 58077.

It is an arithmetic number, because the mean of its divisors is an integer number (18422316).

Almost surely, 2^138621023 is an apocalyptic number.

138621023 is a deficient number, since it is larger than the sum of its proper divisors (8757505).

138621023 is a wasteful number, since it uses less digits than its factorization.

138621023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113793.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 138621023 is about 11773.7429477630. The cubic root of 138621023 is about 517.5389414246.

Adding to 138621023 its reverse (320126831), we get a palindrome (458747854).

The spelling of 138621023 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, twenty-three".