138723843 has 8 divisors (see below), whose sum is σ = 188455248. Its totient is φ = 90737504.

The previous prime is 138723839. The next prime is 138723863. The reversal of 138723843 is 348327831.

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 138723843 - 2² = 138723839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138723863) 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, 436080 + ... + 436397.

It is an arithmetic number, because the mean of its divisors is an integer number (23556906).

Almost surely, 2^138723843 is an apocalyptic number.

138723843 is a deficient number, since it is larger than the sum of its proper divisors (49731405).

138723843 is an equidigital number, since it uses as much as digits as its factorization.

138723843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872533.

The product of its digits is 96768, while the sum is 39.

The square root of 138723843 is about 11778.1086342417. The cubic root of 138723843 is about 517.6668686358. Note that the first 3 decimals are identical.

The spelling of 138723843 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, eight hundred forty-three".