138287423 has 2 divisors, whose sum is σ = 138287424. Its totient is φ = 138287422.

The previous prime is 138287419. The next prime is 138287447. The reversal of 138287423 is 324782831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138287423 - 2² = 138287419 is a prime.

It is a super-2 number, since 2×138287423² = 38246822719961858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138287473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69143711 + 69143712.

It is an arithmetic number, because the mean of its divisors is an integer number (69143712).

Almost surely, 2^138287423 is an apocalyptic number.

138287423 is a deficient number, since it is larger than the sum of its proper divisors (1).

138287423 is an equidigital number, since it uses as much as digits as its factorization.

138287423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 138287423 is about 11759.5672964612. The cubic root of 138287423 is about 517.1234448643.

The spelling of 138287423 in words is "one hundred thirty-eight million, two hundred eighty-seven thousand, four hundred twenty-three".