138426723 has 24 divisors (see below), whose sum is σ = 213158400. Its totient is φ = 86312304.

The previous prime is 138426713. The next prime is 138426727. The reversal of 138426723 is 327624831.

It is a happy number.

It is not a de Polignac number, because 138426723 - 2⁴ = 138426707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138426727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8386 + ... + 18632.

It is an arithmetic number, because the mean of its divisors is an integer number (8881600).

Almost surely, 2^138426723 is an apocalyptic number.

138426723 is a deficient number, since it is larger than the sum of its proper divisors (74731677).

138426723 is a wasteful number, since it uses less digits than its factorization.

138426723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10351 (or 10348 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 138426723 is about 11765.4886426361. The cubic root of 138426723 is about 517.2970232473.

The spelling of 138426723 in words is "one hundred thirty-eight million, four hundred twenty-six thousand, seven hundred twenty-three".