188138723 has 2 divisors, whose sum is σ = 188138724. Its totient is φ = 188138722.

The previous prime is 188138651. The next prime is 188138749. The reversal of 188138723 is 327831881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 188138723 - 2¹⁰ = 188137699 is a prime.

It is not a weakly prime, because it can be changed into another prime (188158723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94069361 + 94069362.

It is an arithmetic number, because the mean of its divisors is an integer number (94069362).

Almost surely, 2^188138723 is an apocalyptic number.

188138723 is a deficient number, since it is larger than the sum of its proper divisors (1).

188138723 is an equidigital number, since it uses as much as digits as its factorization.

188138723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 188138723 is about 13716.3669752599. The cubic root of 188138723 is about 573.0063005215.

It can be divided in two parts, 1881 and 38723, that added together give a palindrome (40604).

The spelling of 188138723 in words is "one hundred eighty-eight million, one hundred thirty-eight thousand, seven hundred twenty-three".