138775723 has 2 divisors, whose sum is σ = 138775724. Its totient is φ = 138775722.

The previous prime is 138775667. The next prime is 138775739. The reversal of 138775723 is 327577831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138775723 - 2⁹ = 138775211 is a prime.

It is equal to p_7846792 and since 138775723 and 7846792 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138775723.

It is not a weakly prime, because it can be changed into another prime (138775223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69387861 + 69387862.

It is an arithmetic number, because the mean of its divisors is an integer number (69387862).

Almost surely, 2^138775723 is an apocalyptic number.

138775723 is a deficient number, since it is larger than the sum of its proper divisors (1).

138775723 is an equidigital number, since it uses as much as digits as its factorization.

138775723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 43.

The square root of 138775723 is about 11780.3108193290. The cubic root of 138775723 is about 517.7313930158.

It can be divided in two parts, 13877 and 5723, that added together give a square (19600 = 140²).

The spelling of 138775723 in words is "one hundred thirty-eight million, seven hundred seventy-five thousand, seven hundred twenty-three".