138225723 has 4 divisors (see below), whose sum is σ = 184300968. Its totient is φ = 92150480.

The previous prime is 138225721. The next prime is 138225743. The reversal of 138225723 is 327522831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 327522831 = 3 ⋅109174277.

It is a cyclic number.

It is not a de Polignac number, because 138225723 - 2¹ = 138225721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138225721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23037618 + ... + 23037623.

It is an arithmetic number, because the mean of its divisors is an integer number (46075242).

Almost surely, 2^138225723 is an apocalyptic number.

138225723 is a deficient number, since it is larger than the sum of its proper divisors (46075245).

138225723 is an equidigital number, since it uses as much as digits as its factorization.

138225723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46075244.

The product of its digits is 20160, while the sum is 33.

The square root of 138225723 is about 11756.9436079280. The cubic root of 138225723 is about 517.0465247263.

The spelling of 138225723 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, seven hundred twenty-three".