138249623 has 2 divisors, whose sum is σ = 138249624. Its totient is φ = 138249622.

The previous prime is 138249611. The next prime is 138249659. The reversal of 138249623 is 326942831.

138249623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138249623 - 2¹⁰ = 138248599 is a prime.

It is a super-2 number, since 2×138249623² = 38225916519284258, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_7818734 and since 138249623 and 7818734 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138249673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69124811 + 69124812.

It is an arithmetic number, because the mean of its divisors is an integer number (69124812).

Almost surely, 2^138249623 is an apocalyptic number.

138249623 is a deficient number, since it is larger than the sum of its proper divisors (1).

138249623 is an equidigital number, since it uses as much as digits as its factorization.

138249623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 138249623 is about 11757.9599846232. The cubic root of 138249623 is about 517.0763230868.

The spelling of 138249623 in words is "one hundred thirty-eight million, two hundred forty-nine thousand, six hundred twenty-three".