138940623 has 8 divisors (see below), whose sum is σ = 205838000. Its totient is φ = 92627064.

The previous prime is 138940621. The next prime is 138940639. The reversal of 138940623 is 326049831.

It is not a de Polignac number, because 138940623 - 2¹ = 138940621 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 (138940621) 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, 2572948 + ... + 2573001.

It is an arithmetic number, because the mean of its divisors is an integer number (25729750).

Almost surely, 2^138940623 is an apocalyptic number.

138940623 is a deficient number, since it is larger than the sum of its proper divisors (66897377).

138940623 is an equidigital number, since it uses as much as digits as its factorization.

138940623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145958 (or 5145952 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 138940623 is about 11787.3077078695. The cubic root of 138940623 is about 517.9363763084.

The spelling of 138940623 in words is "one hundred thirty-eight million, nine hundred forty thousand, six hundred twenty-three".